“…subjects were asked to lay out a series of pictures in time order. English speakers laid them out from left to right, Chinese speakers laid them out from top to bottom, and members of the Aboriginal tribe…invariably laid the pictures out from East to West, regardless of the direction they were facing.”
In theory, every rainbow is a circle, but from the ground, only its upper half can be seen.
Rainbows are not a physical object. When you move forward towards one, it will move back the same distance. This can be seen from a plane: