Journeys: Skeleton. Stop 2

Joints

Bones are joined by joints. Drag the hand and bend the arm at the elbow!

The elbow is like a door hinge. It bends only one way. Now swing the arm round at the shoulder!

The shoulder is like a ball in a cup. It lets you swing your arm in a circle.

Joints are oiled by a liquid, so bones slide and don't creak.