Any idea how they do this...?

I saw this site the other day, a huge media company down the road from us, and I really can’t figure out how they did this. At first you think, so what, some magnets, I can drag them, big deal.
Then you realise that next time you go back that the magnets are in the same place…and they what really freaks you out is when somone the other side of the world (or in your office) starts moving them about and they are moving realtime in front of you…
www.fallon.co.uk