gecko but not but - main article: Esse est percipi

by /kallu

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A gardener, an architect, and a lawyer are discussing which of their vocations is the most ancient. The gardener comments, "My vocation goes back to the Garden of Eden, when God told Adam to tend the garden." The architect comments, "My vocation goes back to the creation, when God created the world itself from primordial chaos." They both look curiously at the lawyer, who asks, "And who do you think created the primordial chaos?"

If a tree falls in a forest and no one is around to hear it, does it make a sound? This popular philosophical riddle appears often in pop culture, and raises many difficult questions regarding observation, and our knowledge of reality.
(cited from WP )