Black hole - a metaphor for a state of ignorance (ours). Such ignorance arose from a natural selective process that censored information that might otherwise interfere with evolution's 'survival of the fittest' axiom. For example: if human existence depended on survival of the most aggressive, than at some point there may arise cognitive conflicts that could inhibit men from fighting. As competition grew more fierce human awareness of their shameful but 'necessary for survival' violence was gradually banned from entering conscious awareness. This is my understanding of a black hole. This is the information that has been lost. It will be released when the ignorance evaporates.