Science Why a ball in a box vanishes as you add more dimensions Ellsworth Toohey

puzzles Four students solved a geometry puzzle by pretending squares were resistors Ellsworth Toohey

Science Two twisty doughnut shapes solve a 150-year-old geometry puzzle Ellsworth Toohey

mathematics The staircase paradox proves you can't always trust your limits Ellsworth Toohey

Science Pyramidal object always corrects itself Rob Beschizza

education This delightful pond puzzle asks you to solve a geometric problem with moral undertones Ellsworth Toohey

geometry Why did this famous mathematician want a 17-sided shape on his tombstone? Ellsworth Toohey

Engineering A cube balancing on one corner Rob Beschizza

geometry Zone out watching and configuring hyperdimensional cubes Rob Beschizza

california Retired educator teaches youth geometry and math through quilting, and they love it Rusty Blazenhoff

geology Mount Taranaki, a "circle visible from space" Rob Beschizza

geometry Why wombat poop is shaped like a cube Clive Thompson

Games The strange world of spherical geometry Rob Beschizza

geometry The Gömböc is an object with only one two equilibrium points, one stable and one unstable Mark Frauenfelder

music Cathryn Aison and Philip Glass's lovely abstract animation for Sesame Street (1979) David Pescovitz

math How many triangles do you see? David Pescovitz

Science Embodied logic: Using stimuli-responsive materials and geometric principles to create smart objects Cory Doctorow

art Make your own M.C. Escher-style metamorphosis Rob Beschizza

Kids Watch how to 3D print freaky, wobbly sphericons Andrea James

happy mutants A ball that inverts and changes color when it is midair, and the scientific literature that explains it Cory Doctorow