Some examples from the last Math Gallery event:

MAthematical Gallery

The meeting will include a gallery of mathematical art, models, games et cetera. Meeting attendees are encouraged to bring something along for the gallery - really anything that has some mathematical connection is appropriate!

Conference home
A large rhombic dodecahedron made by plaiting paper strips.
A visual proof that the laminated lattice in 3d is equivalent to the face-centered cubic lattice.
Projective geometry - the points are parallel classes of lines.
3 golden rectangle inscribed in an icosahedron.
Proving the Pythagorean theorem with a puzzle.
Some 3d printed math objects - Steiner's Roman surface and the Costa surface.
A colorful spiral on a vinyl record.
The Fibonacci series in fiber arts.
A rather large Sierpinski tetrahedron.