pentagon

Amman tiling is an aperiodic set of two tiles and a foursome of ‘golden rhombohedra’, which form aperiodic tilings...

cube a solid object with six square sides of equal size...

heptagon is a seven-sided polygon or 7-gon. A regular heptagon, in which all sides and all angles are equal,...

annulus or little ring, is a ring-shaped object, a region bounded by two concentric circles…   annulus →

deltoid curve a hypocycloid of three cusps. In other words, it is the roulette created by a point on...

square a flat shape with four sides of equal length and four angles of 90°

golden section golden rectangle or golden mean, is the division of a line so that the whole is to...