How The F Could A Human Do Something Like That? I Want To See A Video Of That Guy In Action.

Beautiful! 

Double Arm

This sketch was made by rotating point 1 around a circle, rotating point 2 around point 1, and then joining a line between point 1 and point 2. In the gif point 2 is traveling in the same direction as point 1. Point 1 is traveling at 1x, and point 2 is traveling at 2x. Following the gif are some of my favorite combinations of the periods:

Rotating same direction:

1x and 1x

1x and 2x

1x and 5x

2x and 1x

2x and 5x

5x and 8x

The last image is an array of all the varieties from 1x to 9x for each point.

code: http://p5js.sketchpad.cc/sp/pad/view/jLceHatXid/latest

Master of geogebra helped me out with this! Thanks!

Table Saw

@mrvmt requested a table saw sketch, and this is the first draft. In GeoGebra here.

Would like a map of the whole area, just to know for sure i’ve been to all the places :)

Wow, this is the coolest comic i ever read! Got your book (”What if?”) and now think its the second coolest thing i read! :) Keep it up!

Geometry apps!

I have stumble upon some of the neatest apps, for a person like me that love geometry, these apps are just what I’ve been looking for!

Euclidea:

IOS: https://itunes.apple.com/app/id927914361 Android: https://play.google.com/store/apps/details?id=com.hil_hk.euclidea This app is only Euclidean geometry, that’s what I like the most. Appinfo: Euclidea is a brilliantly original way to learn about, explore and have fun with Euclidian Constructions! Your task is to solve interesting challenges by building geometric constructions with a straightedge and compass. If you design the most elegantly simple solutions in the least number of moves, you’ll earn the highest scores. Solutions are scored in lines (L) and elementary Euclidean constructions (E).

XSection:

IOS: https://itunes.apple.com/us/app/xsection/id1069933287?mt=8 Haven’t found it on Android yet, but this app aims to learn you about Polyhedrons, cross sections and geometry. Appinfo: Learn how to construct cross sections of polyhedrons. Study different techniques, train yourself, and then solve geometric puzzles. 

Pythagorea:

IOS: https://itunes.apple.com/us/app/pythagorea-geometry-on-square/id994864779?mt=8 Android: https://play.google.com/store/apps/details?id=com.hil_hk.pythagorea&hl=sv Just found this game, so I paste the appinfo: Pythagorea is a collection of geometric puzzles of different kind that can be solved without complex constructions or calculations. All objects are drawn on a grid whose cells are squares. A lot of levels can be solved using just your geometric intuition or by finding natural laws, regularity, and symmetry. 

Pythagorea60:

IOS: https://itunes.apple.com/us/app/pythagorea-60-geometry-on/id1043064990?mt=8 Android: https://play.google.com/store/apps/details?id=com.hil_hk.pythagorea60&hl=sv Just found this game, so I paste the appinfo: Pythagorea 60° is a collection of more than 270 geometric problems of different kind that can be solved without complex constructions or calculations. All objects are drawn on a grid whose cells are equilateral triangles. A lot of levels can be solved using just your geometric intuition or by finding natural laws, regularity, and symmetry. 

Horis International Limited

All these games are made from the same developer, Horis International Limited:  IOS: https://itunes.apple.com/us/developer/horis-international-limited/id646324304 Android: https://play.google.com/store/apps/developer?id=HORIS+INTERNATIONAL+LIMITED Big up, love this!

Oh, so your from Denmark then, or maybe its “Skåne” ? :)

A sphere made out of straight lines! Beautiful! 

Hypotrocoid

http://www.malinc.se/math/trigonometry/spirographen.php

This beef just got REAL!

NDT just murdered B.o.B.

Got two Mongolian friends here at work if you want me to ask them? :)

Here’s my first attempt at Mongolian calligraphy.

I would greatly appreciate feedback.

Hej Malin. Hoppas du förstår svenska, annars kommer det på engelska under. Har du kvar koden till denna? Skulle så gärna vilja se en loop. dra ner hastigheten på den lite och se detaljerna lite mer. Tack på förhand!

Hey Malin. I hope you understand swedish, in otherwise i’ll write it in english below. Do you still got the code for this one? I would like to see it in a loop and slow down the speed a bit, just to see more details. Thanks in advance! Take care!

Tangent Circles

http://www.malinc.se/math/geometry/dothisen.php

Väldigt vackert när det är Mondrian målning som reflekteras om. Wow! Jag undrar hur en “grid” av rutor 1x1 skulle se ut efter den blivit omgjord.  Dags att uppgradera mina programeringsskills och göra egna program.. :)

Edit: Malin hade gjort ett fint program redan för detta. MEN, att rita raka stäck med mus är sådär halv lätt.. Resultat : 

When reflecting a painting in a circle, pen strokes close to the centre of the circle become thicker. Reflecting a pixel-based image would enlarge and distort some pixels.  A painting built of strokes, like a Mondrian-painting, is better suited for circle inversion.

 Paint Circle-Inverted Mondrian:

http://www.malinc.se/m/InvertedMondrian.php