Roope Kaaronen @roopekaaronen.net · 27/09/2026Did you know humans around the world have made string figures (cat's cradles)? And even stranger, the exact same figures to surprising degrees of complexity. In the thread below, we try to unravel this mystery: 0267
Roope Kaaronen @roopekaaronen.net · 25/09/2026Aamun Hesarissa pohdin syntyjä syviä. www.hs.fi/tiede/art-20... 161
Roope Kaaronen @roopekaaronen.net · 23/09/2026Also, an argument can be made that hating these beings should be illegal. 020
Roope Kaaronen @roopekaaronen.net · 23/09/2026The most hated birds of Finland are quite beautiful if you are open-minded. Art deco. 3121
Roope Kaaronen @roopekaaronen.net · 18/09/2026This article wins the data visualisation of the month contest. www.mdpi.com/2571-550X/9/... 45814
Roope Kaaronen @roopekaaronen.net · 07/09/2026I feel so blessed to see the Sandstorm steps every day as I go to work. 131
Roope Kaaronen @roopekaaronen.net · 02/09/2026When listening to old Finnish children's songs, the Youtube algorithm almost always escalates to full-steam socialism. Man, the 70s were wild. A million little ants, unite! 🚩 140
Roope Kaaronen @roopekaaronen.net · 01/09/2026Nimittäin aiemmin ihmeteltiin sitä, että ihmiset ympäri maailman ovat tehneet tismalleen samanlaisia narukuvioita. Muinaisia keksintöjä nämäkin. 020
Roope Kaaronen @roopekaaronen.net · 01/09/2026Juuri nyt työn alla: ihmiset ympäri maailman ovat piirtäneet tai rakentaneet käytännössä tismalleen samanlaisia labyrintteja. Mitähän ihmettä nyt taas. 220
Roope Kaaronen @roopekaaronen.net · 31/08/2026Really enjoyed this one. On "Tower of Babel" -like myths, Berezkin's mythology database claims to have dozens of such cases indexed. Not sure how carefully they have been vetted. :) Attached is one similar case I found when doing mushroom research. 2113
Roope Kaaronen @roopekaaronen.net · 09/07/2026inb4 "haha KKK" – when I was a kid, we actually had "KKK Supermarket". 3100
Roope Kaaronen @roopekaaronen.net · 09/07/2026In a highly unexpected turn of events, Iranians are parading Ali Khamenei's frozen body in a *Finnish supermarket truck*. 2279
Roope Kaaronen @roopekaaronen.net · 29/06/2026A job I'm most proud of is my tenure as the Shedmaster of a 93-year-old kayaking club. It's voluntary work, and I maintain a fleet of 50 kayaks. Fixing them and keeping them seaworthy, enabling a hobby for 200+ people. Kayaks have taken me to amazing places and I want others to experience it, too. 080
Roope Kaaronen @roopekaaronen.net · 29/06/2026Morning run with stroller, baby falls asleep, end run by jumping into the cold Baltic sea. Peak parental leave. The running stroller has easily been the best parent purchase so far. 100s of km already. Surprisingly easy to run with. And the baby enjoys these running naps. 160
Roope Kaaronen @roopekaaronen.net · 18/05/2026Got a new toy. I play many instruments, but not the keyboard. I was watching Billy Preston playing on the Get Back documentary and that was the final straw. Time to learn a new one. 060
Roope Kaaronen @roopekaaronen.net · 13/05/2026Tänään opin, että Pikku Prinssi on käännetty myös savoksi. 120
Roope Kaaronen @roopekaaronen.net · 13/05/2026Hetkonen. Eikös tämä hallitus liki ensitöikseen poistanut aikuiskoulutustuen? Miten tämä nyt eroaa siitä? Ei siinä, parempi näin kuin toisin. /Badabim 370
Roope Kaaronen @roopekaaronen.net · 13/05/2026On se vaan kiero tilanne, että tällainen kehitys tulkitaan Suomen taloudelle ja hyvinvoinnille elintärkeänä. Ja että ilman ei pärjätä. Ymmärrän kyllä, miten kuluttajaluottamuksen puute on ongelma. Oikeasti. Mutta pikamuoti +13%, lentäminen ja autoilu +11%... Kyllä tämä on tuhon tie. 221
Roope Kaaronen @roopekaaronen.net · 26/04/2026If a native English speaker has an issue with that... So be it? But I hope they some day take note of what a massive privilege it is to be able to do science in their native language. And notice how we cater to their privilege (which, of course, also has a problematic colonial history!). 1177
Roope Kaaronen @roopekaaronen.net · 31/03/2026That's the last of the sea ice melting. I am so ready for spring. Everything looks HD and colourful. 0120
Roope Kaaronen @roopekaaronen.net · 15/03/2026A reviewer for the Illustrated Times (1867) described their show in London. The top, they wrote, "looks like a living thing [...] spinning up and down a long stick [...] then along the outstretched arms and across the back [...] upon the ridge of an open fan, and finally upon the edge of a sword." 120
Roope Kaaronen @roopekaaronen.net · 15/03/2026Top of the morning! Today: the Matsui Gensui Troupe, a family of Japanese top-spinners who toured Europe in the 1860s. This 1865 woodblock print and photo show members of the Troupe performing tricks including spinning tops on fans, planks, edges of swords, and stacking them on top of each other. 174
Roope Kaaronen @roopekaaronen.net · 13/03/2026I see yours and raise mine. Copper body with ruby contact point. Yes, it's a video. 0163
Roope Kaaronen @roopekaaronen.net · 13/03/2026Top of the morning to you! This top is an interesting one. A whip-top with ivory inlays in alternating colours. It's from the Tomb of Tutankhamun! Over 3000 years old. "The top was one of the most beloved toys of Egyptian children." Source: www.globalegyptianmuseum.org/record.aspx?... 0101
Roope Kaaronen @roopekaaronen.net · 12/03/2026Endnote: tops also feature in literary texts by Plato, Homer, Virgil, etc., the latter marvelling the liveliness of the top! Thanks to top-notch collaborators @felixthehauskat.bsky.social, @izzywisher.bsky.social, @ndersen.bsky.social, Marlena Billings, Charles Egeland & Rebecca Schwendler. / end 2191
Roope Kaaronen @roopekaaronen.net · 12/03/2026We also argue that the top may be one of humanity’s early experiments in ethnophysics. Spinning a top lets you isolate/observe angular momentum and gyroscopic stability, rarely visible in nature. The toy might even pre-date the tool: spindle whorls, (fire) drills, wheel rely on similar principles. 1214
Roope Kaaronen @roopekaaronen.net · 12/03/2026Beyond play, tops feature in harvest rituals, wind-calling ceremonies, mourning rites, mythology, cosmology… We discuss a *lot* of such top-lore. Tops are also highly competitive. In some societies, top-spinning was the most popular game, with players trying to split their opponents' tops in half. 2130
Roope Kaaronen @roopekaaronen.net · 12/03/2026We also establish a baseline of top sizes and materials for archaeologists. Most tops are made of wood, seeds, fruits... materials that decompose. The archaeological record almost certainly underrepresents tops. Yet: there was nothing stopping Late Pleistocene hunter-gatherers from making them. 1140
Roope Kaaronen @roopekaaronen.net · 12/03/2026The peg-top is different. It clusters across South(east) Asia, esp. in Malayo-Polynesian societies. Unlike other tops, it’s tricky to figure out how to spin a peg-top just by looking at one. You need someone to show you. We think this opacity explains why it spread mostly by cultural transmission. 2151
Roope Kaaronen @roopekaaronen.net · 12/03/2026Twirlers, whip-tops, and supported tops are found practically everywhere in our ethnographic/archaeological data. Their mechanical simplicity means they were likely invented independently many times over: stick a twig through an acorn and you have a twirler. I tried this myself last autumn: 2263
Roope Kaaronen @roopekaaronen.net · 12/03/2026We asked: are different top types distributed randomly across the globe, or do some show spatial clustering suggestive of cultural transmission? We built a geographically explicit dataset and measured patterns of clustering. 1120
Roope Kaaronen @roopekaaronen.net · 12/03/2026Tops are ancient. The oldest known specimens are twirler tops from the tomb of Hemaka in Egypt, ca. 5100 years old (first post). They were valuable items, made of copper, crystal, ivory, etc., stored in an ornate box. We are also aware of tops in Ancient Middle-East, India, Greece, by the Inka, etc. 1150
Roope Kaaronen @roopekaaronen.net · 12/03/2026First, some basic top-ology. Tops come in four types, classified by the mechanism by which you set them spinning. A. Twirler: twisted by hand B. Supported top: launched with a cord and handle C. Peg-top: thrown with a wound string D. Whip-top: kept going by whipping its side 1201
Roope Kaaronen @roopekaaronen.net · 12/03/2026Play was historically quite neglected in anthropology and archaeology. So much so that one of the most widespread games in human history has never received a systematic cross-cultural study. To amend that, we systematically compiled a dataset of 1391 spinning tops from 347 societies. 25312
Roope Kaaronen @roopekaaronen.net · 12/03/2026Did you know that the spinning top is one of the most common forms of traditional play worldwide? Our research found tops to be nearly universal across human cultures. Wherever you come from, your ancestors probably spun tops. New preprint: Top of the World osf.io/preprints/so... Thread: 112852
Roope Kaaronen @roopekaaronen.net · 12/03/2026The logo of Posit (formerly RStudio), which you see every time you launch RStudio, looks a lot like the one of the most commong string figures worldwide. Also known as the Ancient Greek knot, Plinthios Brokhos Tetrakyklos. It's the one in my profile picture. 040
Roope Kaaronen @roopekaaronen.net · 07/03/2026Re. "some designs simply don't need to be improved." The Antrea net was knotted ca. 10,500 years ago. It's the oldest surviving fishing net, discovered in Karelia, (then) Finland. Back when the Baltic sea was a lake. It uses the same knots (sheet bends) as fishing nets, volleyball nets, today. 180
Roope Kaaronen @roopekaaronen.net · 13/02/2026My office khipu grows. Practicing its different logics and many ways of representing data. One observation is how *tactile* reading the khipu is. A lot of the embedded information is aided by feeling the cord, and not just looking at it. 090
Roope Kaaronen @roopekaaronen.net · 01/02/2026Sunset run on the sea. I'll be kayaking this same route in two months. Helsinki can be really nice at times. 0172
Roope Kaaronen @roopekaaronen.net · 30/01/2026One of my khipus-in-progress now hanging in my office. It's definitely been fun to learn the ins and outs of the system. Honestly, more intuitive than expected (except for the nuances where scholars disagree). 1110
Roope Kaaronen @roopekaaronen.net · 29/01/2026The frozen sea in Helsinki. Ten day forecast looks like we might be able to walk to the islands this February. Been a few years since the last time that was possible. 1225
Roope Kaaronen @roopekaaronen.net · 15/01/2026I read a lot of obscure books for my research. Such as this 1955 PhD thesis, which looks like it hasn't been opened in decades (ever?): it still had the invitation card for the post-defense reception inside. "RECEPTIE NA AFLOOP VAN DE PROMOTIE IN HET UNIVERSITEITSGEBOUW" 0111