Tweet Archive 2020 11
Replying to @tim_hutton
Adding more space dimensions isn’t too hard - only the up-down dimension needs to be distorted in this constant-gravity setting.
More complex version of the app here: https://timhutton.github.io/GravityIsNotAForce/constant_gravity_4d.html
Replying to @3Dmattias
Oh no. The Flat Earthers won’t be happy.
I’ve just realised that an inertial frame in a circular orbit around Earth is equivalent to travelling at a constant distance above a flat Earth in the absence of gravity. So maybe the Flat Earthers were right all along.
RT @GeneticJen: Everyone learning to play an instrument in 2020 lockdown https://twitter.com/iamCiaraKing/status/1323211194052857856
A rainbow is not a spectrum. I took this photo of a rainbow just now, where the repeated purple-green banding on the inside of the bow is very visible. A simulation on the furthest right shows the effect, which is caused by the multiple possible light paths within each droplet.
Replying to @tim_hutton
Simulation image from Wikipedia: https://en.wikipedia.org/wiki/Rainbow
RT @tejaKrasek: Must watch: Antoni Gaudi’s Sagrada Familia Basilica… by Dr. Mark Burry https://www.youtube.com/watch?v=MEvLFkOTbwU Big congratulations for ou…
Replying to @tejaKrasek and @mcb_1
This is a fantastic talk, thank you for sharing. I was gripped.
Replying to @tejaKrasek and @mcb_1
More great details in this earlier talk, including computer graphics videos of the hyperboloids intersecting to form the distinctive scalloped window shapes. https://youtu.be/DKEhWLr9bsg
Predictable presumably because the mail-in ballots got randomised in the mail. Maybe we should shuffle all of the ballots, to make things less nail-biting. https://twitter.com/jhaurum/status/1324640634398003201
Replying to @ZoeLGriffiths
Forget about colour, unless you plan to print a lot. (The ink in ink-jet printers dries and clogs. Use a print service for photos.) We’ve had a b/w laser (Samsung SCX-3405W) for years and love it. The toner lasts a long time.
Classic. Nice catch by @PhilRodgers
Brexiters should read this thread and hang their heads in shame. https://twitter.com/antoguerrera/status/1325877143163842561
This is amazing. https://twitter.com/Elfiem/status/1326210824411738112
The tops of the Ionic columns are made by using a rollerskate piece. Turns out that reading articles about Lego sets written by knowledgeable (and delightfully nerdy) people is perhaps more entertaining than actually building the thing. https://twitter.com/NewElementary/status/1327249906839347200
After watching this all my questions went away. https://twitter.com/NicoleConlan/status/1326928011963195397
“I felt such a need to rediscover the wind of the high sea, nothing else counted at that moment, neither earth nor men. All Joshua and I wanted was to be left alone with ourselves. Any other thing did not exist, had never existed. …
1/3
Replying to @tim_hutton
(Wondering if this is why @french79music named their album Joshua? https://smarturl.it/French79-Joshua )
3/3
Replying to @tim_hutton
“You do not ask a tame seagull why it needs to disappear from time to time toward the open sea. It goes, that’s all, and it is as simple as a ray of sunshine, as normal as the blue of the sky.” - Bernard Moitessier, The Long Way https://en.wikipedia.org/wiki/Bernard_Moitessier
2/3
Replying to @seanbax
https://www.youtube.com/watch?v=YRgBLVI3suM
Replying to @french79music
Yes yes yes. Amazing. Thank you!
Quick! Publish that explanation/demonstration before you understand it fully. Else (if you’re anything like me) you’ll very quickly forget why you thought it was exciting, and why anyone would be interested in seeing it.
RT @TomCashman: Internships in our team are a brilliantly creative and educational experience, particularly for the project mentors! I lear…
RT @mapo1: The Microsoft Mixed Reality and AI lab in Zurich is hiring:
https://lnkd.in/g4rHcnD https://lnkd.in/gZPChVK https://t.co/6Gdi…
I find it rather beautiful that no matter how complicated a geodesic gets on a pseudosphere, it always unwraps to a straight line on the Klein disk model.
New web app: https://timhutton.github.io/PseudosphereGeodesics/
Replying to @tim_hutton
It’s curious that with hyperbolic geometry there’s a mapping that makes every geodesic into visually a straight line - but not with spherical geometry.
Replying to @gregeganSF
!
Thanks Greg!
Replying to @HypercubicPeg
A similar hexagonal grid weaving: https://twitter.com/tim_hutton/status/1265336787431497730
On now. https://twitter.com/julenka/status/1328485735897255937
Replying to @Tom_Ruen
Elsewhere: https://mobile.twitter.com/tim_hutton/status/1265336787431497730
Replying to @neighbours_wifi
https://twitter.com/tim_hutton/status/1290301308398735360
Replying to @tim_hutton
Over larger distances (20,000km) the gravitational field changes so much that we need a different approach. Here is a 3D embedding created by Rickard Jonsson in 2001. The free-fall trajectories are geodesics (“straight lines”) on the curved surface. https://timhutton.github.io/GravityIsNotAForce/variable_gravity.html
Replying to @tim_hutton
This shows what happens for an object launched with escape velocity. It soon reaches the near-cylindrical part of the surface and then continues on making a helix around it forever.
Replying to @tim_hutton
On the right is a new view where the camera is locked to the frame of reference of the object in free-fall. The object is moving in a straight line but the surface curvature brings it back to earth.
Replying to @astrotoya
I went looking for a word that would emerge on the right hand side. Turns out there aren’t many.
(m+t)(i+e) = mi+me+ti+te (mimetite is a mineral)
Replying to @tleydn
reclone the git repo, reimage the OS, reconsider sheep farming
RT @rmbrualla: We present nerfies! We use selfie videos to create 3d free-viewpoint portrait visualizations of yourself using Deformable Ne…
The future is here. https://twitter.com/LucasVB/status/1332249469019185154
Replying to @Albertotufaile
There’s a visual similarity with Rickard Jonsson’s 3D embedding of 1+1 spacetime. Coincidence? https://twitter.com/tim_hutton/status/1329524633721315372
How the Mandelbrot Set works. Applying the mapping to every point in the radius 2 disk. Linear interpolation between each iteration shows how the points move. The final set is those points that don’t zoom off to infinity under this process. https://github.com/timhutton/mandelstir
Replying to @tim_hutton
Lots of fun things to notice, like the periodicity of the orbits. The big circle has period 2, the one at the top has period 3. Image from Wikipedia.
We’ve spent the most money but had the largest death rate and the worst hit economy. The UK’s government is massively incompetent and corrupt. https://twitter.com/PickardJE/status/1333006428550942720
Replying to @leonard_ritter
and on that tree there was a limb, and on that limb there was a branch, and on that branch there was a nest, and in that nest there was an egg