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pentagon to square
Turn a Pentagon into a Square
square knot from paper strips forms hexagon
Tie a hexagon
different configurations of the move form
Dodecahedral Move Form
pentagons you can fold from a piece of paper
Fold Three Pentagons from a Strip of Paper
heptagon and seven pointed stars
Fold Heptagons from a Strip of Paper
fold equilateral triangle
Fold an Equilateral Triangle of a Given Height
cross you can cut from a piece of paper
Cut Out a Cross with One Straight Cut
Orderly Tangles
Orderly Tangles
miter to gnomon
Hinge from Miter to Gnomon
Star of David can fold to smaller star
Fold a Star of David into a Smaller Star of David
turn an equilateral triangle to square
Turn an Equilateral Triangle into a Square II
Fold a Pentagon from a Circle
Fold a Pentagon from a Circle
Wunderlich's jumping octahedron
Wunderlich's Jumping Octahedron
spherical model of planes of symmetry in a cube
Spherical Model - Cube
12-Celled Collapsoid
12-Celled Collapsoid
rhombic dodecahedron from two cubes
Turn Two Cubes into a Rhombic Dodecahedron I
rhombic dodecahedron from two cubes
Turn Two Cubes into a Rhombic Dodecahedron II
sine and cosine finder
Sine and Cosine Finder
strip of paper folded into fifths
Fold a Strip of Paper into Approximate n-ths
fold cubic equation
Fold the Graph of a Cubic Equation
fraction addition using rotating discs
Fraction Dials
Cardioid and Nephroid String Art
Cardioid and Nephroid String Art
polygons made from Latin cross
Fold a Latin Cross into Four Polyhedra
five intersecting tetrahedra
Five Intersecting Tetrahedra
butterfly ball dual
Butterfly Ball Dual
Peaucellier linkage
Peaucellier Linkage
Hart's straight-line linkage
Hart's Straight-Line Linkage
Watt's parallel linkage
Watt's Parallel Linkage
Chebyshev linkage
Chebyshev Linkage
Tangrams
Tangrams