Tweet Archive 2020 04
Replying to @lisatozzi
“First, it is slightly cheaper; and secondly it has the words END ANXIETY inscribed in large friendly letters on its cover.”
Replying to @tim_hutton
Replying to @robinhouston
Haha no, a render.
Andrew Morozov, Shigui Ruan, Bai-Lian Li (2008) “Patterns of patchy spread in multi-species reaction–diffusion models” Ecological Complexity, Volume 5, Issue 4, Pages 313-328. https://www2.le.ac.uk/departments/mathematics/extranet/staff-material/staff-profiles/am379/list-of-papers/multispecies-patchy.pdf
A parameter map of Figs. 5-8, with delta increasing from left to right.
Replying to @tim_hutton
Thanks again to Tiha von Ghyczy.
da/dt = laplacian_a + a(1-a-chi12b) - ac/(1+gammaa) db/dt = epsilon1laplacian_b + rb(1-b-chi21a) dc/dt = epsilon2laplacian_c + gac/(1 + gammaa) - delta*c
Replying to @tim_hutton
Laplacian Growth, made with Ready: https://github.com/GollyGang/ready
Rendering done with Blender’s Cycles engine.
Full video: https://www.youtube.com/watch?v=vI85hlsbJJw
Replying to @robinhouston
What is pi for a Pringle?
Replying to @RAnachro and @robinhouston
Fortunately all Pringles has a fixed radius.
I’m hoping someone has some Pringles in their house so we can measure it. (Though probably the first thing to have been eaten during quarantine.)
Replying to @robinhouston
A friend went and measured it, and I don’t like the results… His Pringles were 220mm in circumference, from a can with internal circumference 223mm. :(
Replying to @RAnachro and @robinhouston
Someone did the measurements! The circumference is 220mm, and the diameters are 63mm and 60mm (Pringles are elliptical). If they were flat, that would give a circumference of 193.24mm, which means that the value of Pi when measured on a Pringle is around 3.58. Now we know.
Ready 0.10.1 is now out. Contains some amazing new patterns. https://github.com/GollyGang/ready
Video playlist: https://www.youtube.com/playlist?list=PL35FD96A5F8236109
The virus has exposed the immorality of inequality. https://twitter.com/Huwburt/status/1248021250267656192
Replying to @zzznah
I fear this sequel to Primer will be less exciting than the original.
Replying to @KimKierkegaard and @john_overholt
Replying to @lifecreep
This is a still from a @cyriakharris video.
Replying to @mootari
Similar to the falling sand artwork toys. Some of these create amazingly effective rolling hills. Yours is maybe better for sharper crags. https://www.uncommongoods.com/product/deep-sea-sand-art
Replying to @matthen2
Related: https://github.com/timhutton/mandelstir
Replying to @nervous_jessica and @nervous_system
(A still from Contagion (2011))
Replying to @SoftologyComAu and @musabkilic0
As @SoftologyComAu says, this is Fredkin’s replicator rule. Terry Winograd showed in 1970 that it also works when the number of states is any prime number: https://dspace.mit.edu/handle/1721.1/5843 See Other-Rules/Ed-rep.rle in Golly
Replying to @SoftologyComAu and @musabkilic0
Fun fact about Ed Fredkin - he was the inspiration for the character of Professor Falken in the 1983 film War Games.
Replying to @SoftologyComAu, @musabkilic0 and @musabkilic0
it is very cool that you have rediscovered this rule!
In general for N states, set the central cell to the sum of the neighbors modulo N.
Replying to @tim_hutton
Actual coral here, not a simulation:
RT @thesundaytimes: Boris Johnson skipped five Cobra meetings on the virus, calls to order protective gear were ignored and scientists’ war…
Replying to @tim_hutton
“… But would they have had anything wiser to say, or would their local vices merely have been spread more widely?”
“Of course, the inhabitants would not have been so isolated then. They would have been able to communicate more easily, and across vast distances, using their strange devices with the symbol of the bitten apple. …” https://twitter.com/Robert___Harris/status/1164461740983279616
The Cairo tiling hiding in these interlaced hex grids. https://twitter.com/artistescher/status/1252030641497047041
RT @Seb_Falk: You can read my article on this astrolabe ABSOLUTELY FREE in the fabulous new(ish) @WhippleMuseum book. It also features fasc…
Just printing dots on both sides of a sheet of see-through plastic is enough for these 3D effects. The article says its just an optimization problem. How does it work? https://twitter.com/cwervo/status/1254041974103040000
This would make my map of sleeper trains/ferries from Cambridge to Scandinavia look a lot more appealing! https://twitter.com/seatsixtyone/status/1254824703799234562
