An explanation of OBL from a user's perspective.
It’s a little tent! To determine which way a Tent faces, rotate it until its bottom is on the ground. Its flaps will point to either the Left or Right.
You can easily identify the handed-ness of a Kite or Pinwheel by breaking it into Tents; they should all match. So if the Tent’s flaps are facing left, you have a Left Kite or Pinwheel; and if they’re facing right, you have a Right Kite or Pinwheel.