How did they do it?

With a rare afternoon free we decided to go up to Covent Garden, London to see the Alex Chinnack levitating building in the main piazza. Needless to say, this has had a lot of publicity so the crowds were out and at 5pm there was no way I was going to get an exclusive viewing. I was more interested in getting a blip, HG had to find out how it was done (he did, he thinks!) If you'd like to find out more look here. It's only around for the next 3 weeks so do have a look if you are in the area.
For my blip buddies in NZ, USA and especially for GadgetKid who would love this, hope you enjoy it!