Paper folding

thumb|Origami cranes thumb|The folding of an Origami crane thumb|200px|A group of Japanese schoolchildren dedicate their contribution of one thousand origami cranes|senbazuru at the [[Sadako Sasaki memorial in Hiroshima.]]

fractal constructible with L-systems

folded down corner of book page

origami folding pattern

thumb|alt=A hexaflexagon, shown with the same face in two configurations|A hexaflexagon, shown with the same face in two configurations In geometry, flexagons are flat models, usually constructed by folding strips of paper, that can be flexed or folded in certain ways to reveal faces besides the two that were originally on the back and front.

making of artistic works entirely or primarily of paper

rules related to the mathematical principles of origami

Christmas decoration made from paper

thumb|A foldscope thumb|thumbtime=55|Assembling a Foldscope

{|class="wikitable" bgcolor="#ffffff" cellpadding="5" align="right" style="margin-left:10px" width="280" !bgcolor=#e7dcc3 colspan=2|Regular-based right pyramids |- |align=center colspan=2|240pxSix tetrahedra whose vertices meet at the center. Blue edges are doubled with pairs of faces hidden. |- |bgcolor=#e7dcc3|Faces||24 isosceles triangles |- |bgcolor=#e7dcc3|Edges||36 (6 as degenerate pairs) |- |bgcolor=#e7dcc3|Vertices||12 |- |bgcolor=#e7dcc3|Symmetry group||C3v, [3], (*33), order 6 |- |bgcolor=#e7dcc3|Properties||torus |- align=center |colspan=2|240pxNet |} 120px|thumb|A kaleidocycle befo

common practice performed by hotels worldwide as a way of assuring guests that the bathroom has been cleaned

Graphical method for the real roots of a polynomial

result about crease patterns with a single vertex that may be folded to form a flat figure

Result about flat-foldable origami crease patterns

type of artform

polyhedral approximation to a cylinder obtained by stacking antiprisms, used as a pathological example to demonstrate that limits of surface areas of polyhedral approximations do not always equal the true surface area

paper toy