everything is life, and life is an illusion

Behold! Human beings live in an underground cave... They only see their own shadows, or the shadows of one another, which the fire throws on the opposite wall of the cave.
Plato

Once, I, Chang Tzu, dreamed that I was a butterfly and was happy as a butterfly. I was conscious that I was quite pleased with myself but I did not know that I was Tzu. Suddenly I awoke and there I was, visible Tzu. I do not know whether it was Tzu dreaming that he was a butterfly or the butterfly dreaming that it was Tzu.

Chang-Tzu, Book of Chang-Tzu