The moon illusion is one of the most famous of all illusions.

What if the moon hears the secrets we whisper in our lover's ears, and the ones we don't even tell ourselves? What if it already knows the one thing we live in fear that everyone will learn? Of course it knows: it's always up there. It sees everything. This is really unbearable. We don't have any choice but to topple the moon. It won't go away on its own.