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the twelve pentominoes
Pentominoes
truncated octahedron from four bisected cubes
Turn Four Cubes into a Truncated Octahedron
Slide-Together Globe
Slide-Together Globe
folded hyperbolic paraboloid
Fold a Hyperbolic Paraboloid
collapsoid showing two different ways of collapsing
30-Celled Collapsoid
Clifford torus
Clifford Torus
Weaire-Phelan structure made out of paper models
Weaire-Phelan Structure
ellipse by folding
Ellipse by folding
hyperbola by folding
Fold a Hyperbola
parabola by folding
Fold a Parabola
How to Cut out Copies with a Pattern
How to Cut out Copies with a Pattern
mountain vs. valley fold
Key to Symbols in Fold Diagrams
General Instructions for Folding and Gluing a Polyhedron
General Instructions for Folding and Gluing a Polyhedron
rearrange these shapes to form a rectangle with a larger area
Magically Appearing Square I
dodecahedron
Dodecahedron from a Cube
golden rectangle
Fold a Golden Rectangle
Golden Spiral
Golden Spiral
cube cut in half to reveal hexagon
Hexagonal Cross-Section of a Cube
Disappearing Square II
Disappearing Square II
fold tetrahedron and box from net
Fold a Tetrahedron and a Box from the Same Net
d-forms
D-Forms
square twist
Square Twist
Möbius polyhedron
Möbius Polyhedral Model
flexitube puzzle
Flexatube Puzzle
Impossible Triangle
Impossible Triangle
Fold an Equilateral Triangle of a Given Side Length
Fold an Equilateral Triangle of a Given Side Length
Impossible 4-D Quadrilateral
Impossible 4-D Quadrilateral
octagon from paper folds
Fold an Octagon II
fold a series of equilateral triangles
Fold a Series of Equilateral Triangles
Fold an Equilateral Triangle from a Circle
Fold an Equilateral Triangle from a Circle