Although disco music and dancing may be long dead, the disco ball lives on as a staple of dance parties everywhere. [Tim van de Vathorst] spent a considerable amount of time reinventing the disco ball ...

Light bouncing off one disco ball looks cool...if you’re at a middle school dance. Light bouncing off 50 disco balls? That’s a work of art. Or at least it is when you use multiple projectors and 3-D ...

While there’s always some subjectivity in visual perception, some colors are supposed to be constant. Oranges are always orange. Fire trucks are always red. Tennis balls are always yellow. Or maybe ...