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Maurits Ertsen

@mauritsertsen.bsky.social
1.5K followers 452 following 1.9K posts

Interdisciplinary water scholar. And cats... Director of Studies of the MSc program Environmental Engineering at TU Delft, the Netherlands

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Reposted by Maurits Ertsen
Craig Fehrman @craigfehrman.bsky.social · 13/10/2026
Drafting the Past, a terrific podcast that talks to historians as writers, is expanding into a website that reviews nonfiction. You can follow them at @draftingthepast.bsky.social or check out the site: www.draftingthepast.com
draftingthepast.com
Drafting the Past
Reviews, craft essays, news and more for readers and writers of history.
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Maurits Ertsen @mauritsertsen.bsky.social · 12/10/2026
Brilliant cover, looking forward already to reading it!
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Maurits Ertsen @mauritsertsen.bsky.social · 11/10/2026
Basis gelegd, boekje uit. Nu eens lezen hoe rijk een deel van het familiebedrijf is geworden... 🙄😐
Omslag van De Nassaus van Van der Steen.De vier Nederlandstalige delen over de koloniale geschiedenis van Oranje-Nassau bovenop het boek De Nassaus.
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Maurits Ertsen @mauritsertsen.bsky.social · 11/10/2026
The shadow is (always?) spookier than the original... 🫠🙄
Cloth bird hanging on a thread from the body on a lamp, with the shadow of the same bird projected on the wall in a way that suggest another way of hanging...
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Maurits Ertsen @mauritsertsen.bsky.social · 10/10/2026
Check out the program for a series of webinars on Archaeology x STEM! I can fully understand when your agenda on Thursday afternoon Jan 21 2027 is already filled... but you would miss a potentially cool talk about Assyrian irrigation. I wonder who would present, next to Dr. Daniele Morandi... 🫠🙄
Cover page for a webinar series on archaeology and STEM.Overview and reasoning page for a webinar series on archaeology and STEM.Program page with QR Code for a webinar series on archaeology and STEM.
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Maurits Ertsen @mauritsertsen.bsky.social · 10/10/2026
A visitor on the frontdoor stairs.
A wasp on stone stairs.
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Maurits Ertsen @mauritsertsen.bsky.social · 09/10/2026
Het was leuk! Dank.
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Maurits Ertsen @mauritsertsen.bsky.social · 09/10/2026
Ik heb er twee! 😃😃
Omslag van het tijdschrift "Holland". Over gravinnen.
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Maurits Ertsen @mauritsertsen.bsky.social · 09/10/2026
The venue today for the Holland-Utrecht day. Somehow I am reminded of cutting potatoes into fries... 🫠
Stairs in meeting room at Museum Catharijneconvent, with a raster like a potato cutter.Meeting room at Catharijneconvent.
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Maurits Ertsen @mauritsertsen.bsky.social · 08/10/2026
Some more location.
ENCI building, MaastrichtENCI building, MaastrichtENCI building, MaastrichtSigns in ENCI building, Maastricht
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Maurits Ertsen @mauritsertsen.bsky.social · 08/10/2026
My meeting location today... 😉
ENCI building, Maastricht, with audience of the Landschapscontactdag.ENCI building, Maastricht.ENCI building, Maastricht.ENCI building, Maastricht.
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Maurits Ertsen @mauritsertsen.bsky.social · 06/10/2026
A few extra bottles for all the trouble? 🙄😈
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Maurits Ertsen @mauritsertsen.bsky.social · 06/10/2026
Our single tree in the German Eifel tries to show the same spirit! 😃
Tree with fall-colored leaves.Tree with fall-colored leaves.
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Maurits Ertsen @mauritsertsen.bsky.social · 06/10/2026
This morning, TU Delft was as foggy as my brain. At least, TU Delft is more visible now...😉
View on TU Delft in the fog.View on TU Delft.
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Maurits Ertsen @mauritsertsen.bsky.social · 05/10/2026
Some reading coming up. With the English book in the series still expected later.
Five books on how the Dutch royal family made its money, in the colonies and as a family business.
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Maurits Ertsen @mauritsertsen.bsky.social · 04/10/2026
And one is never certain how they may arrive.
Cat doing calculations. Image labelled "Schroedinger's cat".
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Maurits Ertsen @mauritsertsen.bsky.social · 04/10/2026
Autumn details.
Detail of a plant, difficult to describe, lots of small ball-like features.Autumn flower, as in not flowering anymore.Small spiderweb in high grass.High grass with water drops.
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Maurits Ertsen @mauritsertsen.bsky.social · 04/10/2026
Autumn...
Garden with different plants and trees in fall colors.Sweet Gum Tree ("Amberboom") in fall colors.Sweet Gum Tree ("Amberboom") in fall colors.Sweet Gum Tree ("Amberboom") in fall colors.
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Maurits Ertsen @mauritsertsen.bsky.social · 03/10/2026
Brilliant day, let's do some reading outside.
View on a garden landscape, with a cat named Mollie and a book cover of "The Soapman" in the image.
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Maurits Ertsen @mauritsertsen.bsky.social · 02/10/2026
Ok...
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Maurits Ertsen @mauritsertsen.bsky.social · 02/10/2026
Heb je ambities voor zo'n hond?
static.klipy.com
Animated Dog Walking
ALT: Animated Dog Walking
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Maurits Ertsen @mauritsertsen.bsky.social · 01/10/2026
Pretty.
Artwork "Mens en de menigte" in Museum De Valkhof.Detail of artwork "Mens en de menigte" in Museum De Valkhof.Text with artwork "Mens en de menigte" in Museum De Valkhof.
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Maurits Ertsen @mauritsertsen.bsky.social · 30/09/2026
We are back in real time at TU Delft!
Clock on a building, with the correct time!
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Maurits Ertsen @mauritsertsen.bsky.social · 30/09/2026
@tudelftceg.bsky.social has an interesting floor plan. Can you spot the mistakes?
Overview of floors and room numbers.Details of room numbers on floor plan.Details of room numbers on floor plan.List of room numbers on the CEG floor plan. It has room 1.96 twice on the list. Room 1.98 is supposed to be on groundlevel, which goes against the logic. Trust me, it is not there...
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Maurits Ertsen @mauritsertsen.bsky.social · 30/09/2026
Delft Uni of Tech has found its time again. Even when the clock setting may still be somewhat off.
Person working on connecting clock dials to a clock on a building.Person working on connecting clock dials to a clock on a building.Clock with dials on a building.
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Maurits Ertsen @mauritsertsen.bsky.social · 27/09/2026
My world today.
Landscape view close to Vogelensang, Eifel.Church of former village of Wollseifen.View towards Vogelensang.Part of the Vogelensang complex.
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Maurits Ertsen @mauritsertsen.bsky.social · 27/09/2026
I could do the math, but I have too many emails to go through... 🙄😉🤔
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Maurits Ertsen @mauritsertsen.bsky.social · 26/09/2026
Well, for me @profaliceroberts.bsky.social wrote the more convincing of these two books. Obviously, very different books, both on christianity in the world in specific ways. Still, I know which one I prefer, in terms of line of and consistency in reasoning.
Covers of Domination by Roberts and De Ongelooflijke Geschiedenis by Boogerd et al.
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Reposted by Maurits Ertsen
De Speld @speld.nl · 24/09/2026
Witte Huis onthult eerste presentator voor nieuw staatsnieuwszender
speld.nl
Witte Huis onthult eerste presentator voor nieuw staatsnieuwszender
Het Witte Huis heeft de eerste presentatrice van de nieuwe staatsnieuwszender onthuld. Zij zal de kijkers van Trump TV de belangrijkste nieuwsverhalen van de dag vertellen, rechtstreeks afkomstig van de regering-Trump.
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Maurits Ertsen @mauritsertsen.bsky.social · 24/09/2026
My world today.
The Public Transport Museum in The Hague. Inside with model trams and cars.The Public Transport Museum in The Hague. Outside with trams.The Public Transport Museum in The Hague. Outside with trams.The Public Transport Museum in The Hague. Outside with yellow tram.
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Maurits Ertsen @mauritsertsen.bsky.social · 23/09/2026
Well, I work on water infra, so happy to follow up on advice of a fellow PhilOfTech conference participant to check this game! 😃😃🫠🫠
The box of the game "Barrage".
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Maurits Ertsen @mauritsertsen.bsky.social · 22/09/2026
Presenting my own water stuff in a session surrounded by AI-related papers with a shared Q&A: most questions focus on dry items. 🫠🙄 But it was good fun. I could stress one observation that helps me in my own work: through infra one meets the designer(s) and their ideas. This also holds for AI. 😉
Program of day 2 of the PHTR2026 conference, Philosophy of Technology.
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Maurits Ertsen @mauritsertsen.bsky.social · 21/09/2026
Looking forward to three days of philosophy of technology. Guess where (close to).
Stroom, Karel Appel “Frog with umbrella” in The Hague.
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Maurits Ertsen @mauritsertsen.bsky.social · 20/09/2026
"God heeft ... broederschap." Vast wel. Ligt het aan mij of is dit gewoon een eigenaardige zin in een historisch werk? Als we deze entiteit dan toch als historische actor opvoeren, hoort de naam wellicht in het personen- of zakenregister opgenomen te worden? 🙄
Passage uit De Ongelooflijke Geschiedenis van Boogerd et al, p82.Deel van de G van het personenregister van Boogerd et al De Ongelooflijke Geschiedenis.De G van het zakenregister van Boogerd et al De Ongelooflijke Geschiedenis.
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Maurits Ertsen @mauritsertsen.bsky.social · 20/09/2026
Interesting that what Roberts discusses as less useful (seeing christianity as essentially new and different, and almost as not involved in the material - my terminology) is what I think I see happening in the Boogerd et al book. I mean, take caring for others, which has a slightly longer history.
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Maurits Ertsen @mauritsertsen.bsky.social · 20/09/2026
Reading time.
Cat named Mollie rolled up on a lap, next to the book Domination by Roberts. On a Sunday, so highly appropriate... 😉
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Maurits Ertsen @mauritsertsen.bsky.social · 19/09/2026
My world today.
Landscape in the Eifel near Steffeln.Landscape in the Eifel near Steffeln.Eichholzermar in the Eifel near Steffeln.Eichholzermar in the Eifel near Steffeln.
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Maurits Ertsen @mauritsertsen.bsky.social · 18/09/2026
Some comparative reading coming up.
Covers of "Domination" by Roberts and "De Ongelooflijke Geschiedenis" by Boogerd et al, next to each other.
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Maurits Ertsen @mauritsertsen.bsky.social · 18/09/2026
We try to engage historical thinking when designing water systems with our students. It turns out to be very useful to consider design choices knowing systems over time will not work as designed! I am not sure it is critical (what does that even mean?), but it does make engineering students think.
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Maurits Ertsen @mauritsertsen.bsky.social · 18/09/2026
She is back!
A cat named Mollie on the lap of a person sitting at a home office desk.
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Maurits Ertsen @mauritsertsen.bsky.social · 17/09/2026
Submitting two proposal texts (before the deadline!), and finalizing a few non-prop things early (and one very late...) this week. Wow. I feel productive! Probably for five minutes...
static.klipy.com
Sylvester The Cat Shivering with Towels
Alt: Sylvester The Cat Shivering with Towels
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Reposted by Maurits Ertsen
ICEHO @iceho.bsky.social · 16/09/2026
The next World Congress is now announced! We hope to see you all in Toronto, Canada, in 2030. The venue will be at York University, Toronto, and Toronto Metropolitan University and McMaster University will also be a part of the planning, which is headed by Jennifer Bonnell. Read more below! #envhist
iceho.org
The Fifth World Congress of Environmental History — ICEHO
The next World Congress of Environmental History is set to take place in York, Canada, in 2030.
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Maurits Ertsen @mauritsertsen.bsky.social · 14/09/2026
Just finalized a preproposal. Actually, I like it... but that has not prevented rejections before! 😉🫣🙄
static.klipy.com
Droopy Holding 'C' Flag
Alt: Droopy Holding 'C' Flag
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Maurits Ertsen @mauritsertsen.bsky.social · 11/09/2026
Home!
Close-up of a cat named Ginnie on a lap.
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Maurits Ertsen @mauritsertsen.bsky.social · 11/09/2026
View on the inside of The Hague municipality.
The Atrium of The Hague municipality from floor 8.The Atrium of The Hague municipality from floor 8.
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Maurits Ertsen @mauritsertsen.bsky.social · 11/09/2026
My view today, 8th floor of The Hague municipality.
Roofs of The Hague.
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Maurits Ertsen @mauritsertsen.bsky.social · 10/09/2026
I seem to be famous!
View on a ship in Rotterdam with the name "Maurits".View on a ship in Rotterdam with the name "Maurits".
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Maurits Ertsen @mauritsertsen.bsky.social · 10/09/2026
Lonely is the flower.
Yellow flower at the campus of Delft Uni of Tech.
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Maurits Ertsen @mauritsertsen.bsky.social · 09/09/2026
Cool!
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Maurits Ertsen @mauritsertsen.bsky.social · 09/09/2026
Always spectacular.
Maeslantkering and ship.Detail of the Maeslantkering.Maeslantkering and ship.Detail of the Maeslantkering.
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