Rolling discs (www.howround.com)

Take two identical discs and slot them together along diameters so that the discs are perpendicular. There is one separation of centres for which the compound shape has a centre of mass which remains a constant height above the surface of a table. The resulting shape rolls along in a most intriguing way. More information is available from www.howround.com

Category:

Science & Technology

Tags:

• mathematics
• math
• engineering
• mechanics
• roundness

[bachaddict]

i've made one! the slot is cut in about 1/3 of the way to the center.

[randyownd]

lol...