If you are walking west

In the morning you are led by your shadow, an incorporeal, two-dimensional being who tests the way ahead of you with the length of its body. Your shadow is your guide and protector.

But by evening your shadow is flagging. It falls behind you. Moreover, it has some presentiment that its remaining hours are few, as the sun gets lower and lower. In the evening you walk out in front of your shadow, and you are its guide and protector.

What if you're walking east, though? In that case, in the mornin...