http://www.officeplayground.com/Glider-Balance-Mobile-P1547.aspx

Bring the thrill and excitement of gliding through the air right
to your desk with the Glider - Balance Mobile. Just give the hang glider a
gentle push and watch it glide around in circles. Then, imagine that you're
outside and looking down at the Earth on your own hang glider. When you need
some stress relief, give the glider another push for a quick pick-me-up. You may
find yourself playing with this miniature hang glider all day long. Balance
Mobiles are fun kinetic desk toys for your workspace.

Thanks to Jeff O'Brien.