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Thomas Feliciani

@thofel.bsky.social

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Thomas Feliciani @thofel.bsky.social · 03/08/2025

Been playing with Multiple Neighborhood Cellular Automata (#MNCA). MNCA run surprisingly smoothly in R thanks to the efficient "terra::focal()" function, useful for running sequences of convolutions. Next challenge: finding interesting areas within the infinite-dimensional paramater space of MNCA.

This image uses a rainbow (Turbo) color palette to show the average value of raster cells across the first 500 iterations of a continuous-state MNCA, run on a Perlin noise field. Blue cells have a low average, meaning they have been mostly dead. Red cells have a high average and were thus mostly live. All colors in-between (green to orange) show cells that changed state during the simulation, revealing where activity occurred. The image reveals that the little activity that was observed occurred in the high-valued "islands" of the Perlin field, and was specifically concentrated around small, roundish clusters of stationary live cells.

This is another use of the rainbow color palette to show activity (via average values) for the first 30 iterations of a discrete-state MNCA -- of which I forgot the rules/parameters.

A discrete-state MNCA, shown at a particular iteration, with rules/paramteres similar to those reported by @Slackermanz in their guide at https://slackermanz.com/. Live raster cells (white) appear clustered in tighly-packed, bean-shaped blobs. Blobs look like biological cells that propagate slowing eating up all available empty space (dark gray).

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Thomas Feliciani @thofel.bsky.social · 20/04/2025

So it’s that time of the year again. #tulips everywhere :)

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Thomas Feliciani @thofel.bsky.social · 08/02/2025

This is a higher-res, still frame from the video.

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Thomas Feliciani @thofel.bsky.social · 08/02/2025

This picture simultaneously shows all points from all generated time points. Points are colored by their z values.

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Thomas Feliciani @thofel.bsky.social · 08/02/2025

I'm "strangely attracted" to these. Video and pictures show (René) Thomas' attractor emerging from the sampling of the XY plane. For these visualizations, I set b=0.19 and initialized the orbits at z=1. __ en.wikipedia.org/wiki/Thomas%... #Rstats #ggplot2 #viridis #generativeArt #mathArt

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Thomas Feliciani @thofel.bsky.social · 02/02/2025

Not sure how you do it, but here's how I did them. I sampled the x-y space at regular intervals, and then iterated the functions a bunch of times for each pair (x,y). Then I plotted all generated points, coloring them by t. And for the video I varied the two parameters in a loop.

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Thomas Feliciani @thofel.bsky.social · 02/02/2025

I love these so much. About a year ago I ran into your #mathArt and reimplemented your orbits viz in #rstats. Then forgot about them until yesterday, when I run into your work again. Anyway, I just wanted to say thank you for the inspiration!

Orbits in the style of @sconradi.bsky.social

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Thomas Feliciani @thofel.bsky.social · 19/01/2025

Today we got perfect weather. Perfect for a pensive afternoon, that is.

A close up photo of the bright red vegetation growing on the ground, and bushes.

Wintery vegetation on a lake side. The dense fog makes it eerie.

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Thomas Feliciani @thofel.bsky.social · 23/11/2024

A warning sign from a train station in Wallonia: “Tout contact avec les fils peut être mortel!” Hey, daughters can be dangerous, too!

A photo of the underpass wall where I found the warning sign, surrounded by graffiti. The sign reads:
Il est interdit, sur les quais des voies électrifiées
- de lever des objets de grandes dimensions;
- de toucher les fils, même tombés à terre.
Tout contact avec les fils peut être mortel !

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Thomas Feliciani @thofel.bsky.social · 23/12/2023

Gender homophily in research teams, communities fosters gender citation bias. A cool new paper in Research Policy [1] also covered by Nature News [2]. — [1] Zhou et al. 2024 — doi.org/10.1016/j.re... [2] Oza 2023 — doi.org/10.1038/d415...

A screenshot of the online article by Zhou et al. (2024) titled: “Gender homophily: In-group citation preferences and the gender disadvantage”.

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Thomas Feliciani @thofel.bsky.social · 22/12/2023

Found on Italian trains. This sticker forbids getting “on and off while the train is still moving”. They probably meant “on OR off”. And I get funny ideas. Train operators vs logical operators.

This is the photo of sticker glued to a train door. The sticker has a warning sign depicting a falling person followed by a message in Italian, English, French, and German. It reads:
“IT'S STRICTLY FORBIDDEN
To get on and off while the train is still moving.
To get on and off the train outside the platforms. To lean against the doors”.

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Thomas Feliciani @thofel.bsky.social · 09/12/2023

Hello new platform, hello world! Ready to make noise. That is, Perlin noise. With R package “ambient”. And“ggplot2” for rendering. Post-processing with Snapseed. Cheers.

2D Perlin noise rendered with a colorful palette. Intermediate values are rendered in pastel light blue shades and serve as background. Areas with more extreme values appear as “islands”: green-yellow-red for high values and blue-fucsia-white-red for low values. Random grain perturbations are added for texture, and a faux tilt-shift effect makes the 2D plot look like a macro photo of some colorful print.

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