A depiction of the motion of the Alaskan or Eskimo yo-yo. Two strings connected to a handle, one slightly shorter to avoid collisions, rotating in opposite directions. The basic trick or pattern, what Chris Kiana calls the "Eskimo orbit". Powered by centripetal force, the handle, in the center, must be moved up and down slightly, in opposition to the props, to maintain their orbits.
<a href="//commons.wikimedia.org/wiki/User:Hyacinth" title="User:Hyacinth">Hyacinth</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>