Man has been using skulls throughout history to intimidate enemies, to warn of danger, to beckon the morally questionable, and to mark our death vaults.
It’s hard not to react when viewing a human skull. After all, it’s a direct confrontation of our own mortality. The only way to see a skull is after death and after decomposition. That’s pretty profound. Our depictions of Death, or the Grim Reaper, always include a skeleton. Interestingly enough, the Grim Reaper also symbolizes a kind of wisdom, spooky though it may be. Death knows when and how our lives will end. It may be a grudging respect at best, but the skull’s representation of Death denotes a sense of superior judgement.