Existentialism posits or says that man fashions his own existence and constructs his own meaning for life if he can recognize, first, that life is meaningless until he acts to make it meaningful. In other words, life is meaningless unless you realize it can only have meaning if you create meaning. Otherwise, you're just existing in this void or mud hole truly unaware of yourself. One day you may wake up and realize what a ridiculous position you're in, but then again you may not.