How'd they do this?

How does this web-site [ http://www.leoburnett.ca/ ] create the effect of floating in space? I’d like to have a smiliar effect like this on my page and don’t know how to even go about doing it. I thought it might have something to do with detecting the direction of the mouse movement, but no clue.

Please if anyone can help.

Thank you, Jana K.

[URL=“http://www.leoburnett.ca/”]