Professor Richard Wiseman emails:
For the past few months we have been working on a secret project involving the science of illusion and invisibility! In the 1920s a magician presented the plans for a strange illusion that he claimed would make people invisible. It's based on an idea used in modern-day invisibility research and so was years ahead of its time, but no one has ever built the illusion...until now! We have just made a 3 minute documentary about the illusion and put the idea to the test.
Read more about the making of this video here.