My Kinder's just finished their overlapping hands recently. We talked about the difference between line and shapes. Lines are open and Shapes are closed.
They took a black crayon and as a group we drew 3-4 hands. They would trace a hand and turn the paper, trace another hand making sure to overlap. There were times I would circulate the room and help students position their hands so that they are using their space wisely.
Last, is to color each shape that was created when they overlapped their hands. There are always students who don't quite get this or they simply forget. I make sure to repeat these instructions the second day working on this project.