'Magic' boxes make a ball appear in two places at once

Is it smart technology or a conjuring trick? You are given one ball and two boxes. Place the ball in one box and miraculously it appears in both at the same time.

BBC Click's Spencer Kelly demonstrates how an object can appear to be in two places at once.

Can you work out how it is done?

Watch the full programme of BBC Click, broadcast on BBC World News and the BBC News Channel on Saturday 10 and Sunday 11 October 2015.