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

geometry How to make those fancy geometric pies by lokokitchen Rusty Blazenhoff

Kids These deliciously geometric pies are almost too pretty to eat Andrea James

politics "The efficiency gap": understanding the math behind a crucial Supreme Court gerrymandering case Cory Doctorow

geometry Max Brückner’s polyhedral models Clive Thompson

video Watch a mathematician explore non-euclidian geometry with a VR headset Andrea James

art José Bernabé's organic geometry Andrea James

family Video of cube passing through hole in equally sized cube Mark Frauenfelder

geometry iRuler is a website that turns your screen into an inaccurate ruler Rob Beschizza

music Watch mesmerizing forms complement the music of Symmetry Andrea James

geometry How Eratosthenes calculated the circumference of the Earth in 200 BC Mark Frauenfelder

videos The baffling topology of the burrito method for covering your duvet Cory Doctorow

math Fix your floppy pizza slice with Gaussian curvature Andrea James

Internet Site finds the "visual center" of your images Rob Beschizza