copyright M.C. Escher's work will enter public domain in some countries this year but not the United States Mark Frauenfelder
optical illusions In this 3D-printed sculpture, how does the ball defy gravity and roll uphill? David Pescovitz
psychology How to become better at smelling and avoiding the many varieties of bullshit David McRaney
happy mutants MC Escher's "Relativity" recreated in Star Wars Lego, with many in-jokes and grace-notes Cory Doctorow