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[impossiblewizardry]

on a sunny day, you’ll have a shadow. Until you enter the shadow of a building, where you’re illuminated not directly by the sun, but by reverberating light reflecting from surfaces all around you, which has no single source, and thus will not cast a shadow.

Except in Houston, with all of these reflective glass buildings, your shadow will actually change direction as you walk around. When you’re in the shadow of a building, and can’t see the sun, you may still be illuminated from the other direction by the reflection of the sun from a glass building, which is bright enough and coherent enough to cast its own shadow.