BIOCENTRISM

(1) If a tree falls in the forest, and no one is around, does it make a sound?

No, since a tree that falls in an empty forest creates only silent air pulses -- tiny puffs of wind.

(2) If a rainbow appears in the sky, and nobody is around to see it, does it exist?

No, since we are necessary for the rainbow's existence. Three components are required: sun, raindrops, and a conscious eye (or its surrogate, film, whose results will only be viewed later by a conscious observer).

According to BIOCENTRISM, what we perceive as reality is a process that involves our consciousness.