Why does the triangle tower have no shadow?

Answer 1

Everything has a shadow. I think maybe because the shadow is cast upon it's self.

Every object that stands in light casts a shadow, unless that object is light (produces light). A light bulb illuminated on a sunny day,has no shadow of the illumined parts.

A flashlight in the sun light is a waste, a flame from a lighter on a sunny day is almost invisible. If an object casts no shadow, then, that object is light. I like to describe it as, (concerning people) a humble person casts no shadow.