Gro-Tsen Profile picture
Feb 13 10 tweets 3 min read
Since I mentioned The Backrooms (in citing a weird thread about a supposedly real experience that has now been made protected so maybe it was just made up, or maybe They Don't Want Us To Know The Truth™), a few remarks about this Internet legend. ⤵️ •1/10
Since just about forever, I've been fascinated and terrified at once with the idea of huge labyrinthine spaces taking the form of more or less benign empty / abandoned places. I often have dreams about such places that aren't really nightmares but are still disquieting. •2/10
This seems to relate to another fear-with-fascination of mine (or is it just a variation of the same?), that of abandoned places, especially industrial ones, and urban exploration. •3/10
Young me played the computer games ‘Ultima Underworld’ I & II with fear and trepidation as they tapped into this fascination. In real life, I also learned with fascination about catacombs below Paris (and the more impressive ones in Odessa), but I wouldn't dare enter them. •4/10
I wrote a number of games (well, not so much games as amusements) simulating vast, procedurally generated, labyrinthine worlds on the computer. I was fascinated as a kid by the idea of generating essentially endless spaces by a few lines of code. •5/10
This toy (essentially proof-of-concept) game that I wrote, not so long ago, in order to learn about WebGL, despite its trivial simplicity, has a definite flavor of “The Backrooms”, doesn't it: madore.org/~david/misc/we… •6/10
(In a more mathematical flavor, I also wrote this other JavaScript game, which takes place in the hyperbolic plane to illustrate how intrinsically mazelike it is: madore.org/~david/math/hy… — but if you like this sort of things, try playing HyperRogue instead!) •7/10
Anyway, I find it funny that this sort of fascination should have become an Internet meme / legend. For some reason, I thought I was the only one with this particular mixture of fear and fascination (not so much with mazes, but with this particular flavor of them). •8/10
I disagree with one thing regarding the ‘Backrooms’ fad, however: the idea that they are inhabited by “entities” (in essence, monster that try to kill you), in my mind, spoils the whole idea. The danger in the labyrinth is not the Minotaur in the center: … •9/10
… the true foe is the labyrinth itself. The purest form of labyrinth game (or horror story), I think, needs no monsters, for the labyrinth itself is the monster. The Backrooms, I think, are empty of life, and that makes them all the more frightening. •10/10

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More from @gro_tsen

Feb 15
If I claimed that these three vertices of a square grid form an equilateral triangle, would you believe me? A few thoughts on this question. 🧵⤵️ •1/26 A square lattice with the a...
Well, assuming you're not the sort of person who uses a ruler to measure on a monitor (in which case it may be hard to make the call), maybe you use the Pythagorean theorem and compare 4²+15² = 241 to 11²+11² = 242 to conclude that the bottom-right edge is a bit longer. •2/26
But maybe you just know that there are no three vertices of a square lattice that form an equilateral triangle: so I must have cheated. This seems to be the sort of math fact that everyone knows somehow. But why is it true, again? •3/26
Read 26 tweets
Feb 14
Je sais que pour arriver à un haut niveau dans l'administration de la Recherche il faut ne pas trop aimer pratiquer cette dernière puisqu'on lui préfère l'administration, — mais même comme ça, le niveau de bêtise des propos proférés par Antoine Petit ne cesse de me surprendre.
Cherche-t-il à justifier toutes les têtes sur lesquelles il a dû marcher en faisant passer ça pour une saine compétition? À convaincre que comme il a le titre ronflant de PDG du CNRS, c'est qu'il est «le premier» en quelque chose? Je l'ignore.
Il est fort possible que les gens voulant à tout prix être premiers soient de bons chercheurs. (Peut-être que Petit lui-même est excellent — je n'en sais rien.) Mais même si c'est le cas, ce n'est pas en les attirant qu'on obtiendra un progrès collectif:
Read 5 tweets
Feb 13
Promenade cet après-midi avec @Conscrit_Neuneu dans la forêt de Galluis dans le Vexin. openstreetmap.org/#map=13/49.066… Arrivés par Frémainville, ça commençait bien. Mais rapidement nous sommes tombés sur un endroit appelé les “carrières de Feularde(s?)”, et là c'était moins drôle! …
… Ces carrières de Feularde sont un labyrinthe de petits lacs, mares, flaques d'eau dans un terrain boueux (argileux) dévasté par les traces d'engins d'exploitation forestière et/ou de quads ou motocross. Pas agréable du tout de s'y perdre. …… ImageImageImageImage
… (J'écris “perdre”, évidemment nous avions notre position par GPS sur nos smartphones, mais les chemins marqués sur la carte IGN ou OSM n'existaient pas dans la réalité ou inversement. Et des mares infranchissables pouvaient les couper. Nous avons beaucoup erré.)
Read 5 tweets
Feb 12
J'ai passé du temps à faire des diagrammes de ce genre pour illustrer graphiquement l'étagement de la boîte de vitesse de mes motos et de la tuture du poussinet, et mieux pouvoir les comparer. Est-ce que ce genre de dessins est standard? Y a-t-il des conventions à leur sujet? ImageImageImage
Explications: pour chaque rapport de chaque véhicule, je fais une échelle des vitesses atteignables sous ce rapport à différents régimes moteurs. Le trait fin (le plus long) va du régime du ralenti moteur jusqu'à la ligne rouge (cappé à la vitesse maximale).
Le trait plus épais (plus court) se termine au régime qui donne le couple maximal et commence (un peu arbitrairement) à la moitié de ce régime. Et le point épais est placé à la moitié du régime de la ligne rouge (là aussi un peu arbitrairement).
Read 5 tweets
Feb 4
So, it appears that the irascible gods of Twitter granted us yet another feature that nobody wanted: downvotes! Except that I have no idea why the downvote button appears on certain tweets and not others, or what it does. I don't really want to know, but that's not my point.
My point is: THE FACT THAT THE DOWNVOTE BUTTON APPEARS ON CERTAIN TWEETS AND NOT OTHERS MEANS THAT THE “LIKE” BUTTON IS NOT ALWAYS IN THE SAME PLACE. And that, in turn, means that, inevitably, I'm going to downvote some tweets that I meant to like. Great job, guys!
PS: If you don't see a “downvote” button yet, it's because they are, apparently, still in the process of rolling it out. But be assured, like covid and all evil things, the downvote button will come to you as well.

(Actually, I suspect it's just a placebo. Which would be smart!)
Read 4 tweets
Feb 4
J'essaie de calculer la vitesse à laquelle ma moto (Yamaha Tracer 9) avance en fonction de la vitesse de rotation du moteur et j'arrive à un truc assez absurde. J'ai dû faire une erreur débile dans ce qui suit ⤵️, est-ce que quelqu'un a une idée de ce qui ne va pas? •1/9
Je vais faire le calcul pour la vitesse à la ligne rouge en 1er rapport. La ligne rouge est à 10600rpm, donc 10 600 rotations par minute, soit 177 tours par seconde. On est bien d'accord que c'est des tours de l'axe en sortie de moteur, ça? •2/9
Ensuite, il y a une démultiplication par la boîte de vitesse. Ce facteur m'est donné par Yamaha dans le manuel en fonction du rapport:
⁃ 1er: 2.571 (36/14)
⁃ 2e: 1.947 (37/19)
⁃ 3e: 1.619 (34/21)
⁃ 4e: 1.381 (29/21)
⁃ 5e: 1.190 (25/21)
⁃ 6e: 1.037 (28/27)
•3/9
Read 11 tweets

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