This street light — a product of human endeavor — is a visual metaphor representing humanity: the brain-bulb, representing intelligence and enlightenment, is encased in its sturdier, skull-shaped, metal shell. The two objects together represent the tangible and intangible aspects of our human condition.
Raised on a pedestal as a champion for humanity, intelligence shines with bravery amidst the gloomy, unfamiliar atmosphere. However, death (shown as darkness in the corners) is evident, and it is only a matter of time until the light is turned out.
What, then, is the significance of human endeavors?