Plato in his dialogue 'Republic' introduced, with Socrates' words, the concept of the illusion caused by the perception of reality through the limitations of the senses.
I copy here from the Wikipedia:
In the allegory "The Cave", Plato describes a group of people who have lived chained to the wall of a cave all their lives, facing a blank wall. The people watch shadows projected on the wall from objects passing in front of a fire behind them and give names to these shadows. The shadows are the prisoners' reality, but are not accurate representations of the real world.
This piece of music adopts an ambient atmosphere and attempts to recreate a state of mind that vainly attempts to pierce through the limits imposed by our senses.
I hope you will enjoy it.