A fellow organizer gave [Kieran] a [Harry Potter] Magic Candle, which allows him to light the toy with the wave of his IR-enabled wand. He was told to “make it do something cool”, so he took a ...

Any sufficiently advanced hack is indistinguishable from magic ... on a detected wand path“. The basic idea is that a retroreflective dot on the end of the wand reflects light from a set ...