Tags » Curvature

Wallpaper symmetry

Many of us made “snowflakes” as a kid, by folding paper in half horizontally and then vertically, then cutting a design through all the sheets.  (Nevermind that snowflakes should have 6-fold symmetry instead of 4-fold.)  Just as folding paper witnesses mirror reflection, rolling paper into a cylinder witnesses translational symmetry, rolling paper into a cone witnesses rotational symmetry, and rolling with a twist (like with Möbius band) witnesses glide reflection symmetry.   172 more words

Algebraic Topology

Cee's Oddball Photo Contest

Today is indeed an odd day.  I shall actually post three photos!

This is one I call curvature. I took this from my cell phone, using a special effect and edited it slightly

Cee's Photo Challenges