A first and seemingly immediate awareness, which more or less corresponds to the energy stimulation patterns, is referred to as "sensation". "Perception" can be distinguished from sensation in that it refers to a process that requires more organization than sensation, is more heavily dependent on learning than sensation, and requires more time for completion than sensation. Perception involves the organisation and interpretation of sensory data in order to make it meaningful, discarding non-relevant data, i.e. transforming data into information. Perception is a highly sophisticated mechanism and requires existing knowledge and experience to determine what data to keep and what to discard, and how to associate the data in a meaningful manner. Perception creates faces, melodies, works of art, illusions, etc. out of the raw material of sensation.