Gabriel's Horn (also called Torricelli's trumpet) is a geometric figure which has infinite surface area but finite volume. The name refers to the tradition identifying the Archangel Gabriel as the ... -->

Romanesco, also known as Romanesque cauliflower or Romanesco broccoli, is an edible flower bud of the species Brassica oleracea. First documented in Italy, it is light ... -->

In geometry, the rhombicuboctahedron, or small rhombicuboctahedron, is an Archimedean solid with eight triangular and eighteen square faces. There are 24 identical vertices, with one triangle and three squares ... -->

A quasiperiodic crystal, or, put succinctly, quasicrystal, is a structure that is ordered but not periodic. A quasicrystalline pattern can continuously fill all available space, but it lacks translational ... -->

A planimeter (also known as a platometer) is a measuring instrument used to determine the area of an arbitrary two-dimensional shape.
Principle of the linear planimeter
The working of ... -->

In mathematics, particularly geometry, Viviani's curve, also known as Viviani's window, is a figure eight shaped space curve named after the Italian mathematicianVincenzo Viviani, the intersection of a sphere with ... -->

In geometry, the spiral of Theodorus (also called square root spiral, Einstein spiral or Pythagorean spiral) is a spiral composed ofcontiguous right triangles. It was first constructed by Theodorus of Cyrene.
Construction
The spiral ... -->

A Pythagorean tiling or two squares tessellation is a tessellation of an Euclidean plane by squares of two different sizes, in which each square touches four squares of the other ... -->

A gömböc or gomboc is a convex three-dimensional homogeneous body which, when resting on a flat surface, has just one stable and one unstable point of equilibrium. ... -->