There is the field of perceptions, this field of perception "is". When expressing the is of perception I am not invoking the idea or belief in existence. The use of "is" is stating that which is present. The present of perception in not just apprehension of the sense data but includes ideas. Ideas here meaning mental images ether of memory's, mathematical truths, dreams and what ever else may be deemed idea. Also included in the perception are the emotions whether trigger by what one calls the physiological methods of perception (senses), psychological method of perception (ideas), or other emotions (and in truth emotions are a mix of the latter two). Perception then is composed of all that is in this case. One may assume that I am defining perception based of off these predefined components: ideas, emotions, and sensations, but in fact these three constituents are defined based of off perception and not the other way around. Perception is on the out set a wholeness. Only until that wholeness is categorized and put into divided groups do we perceive there being ideas, emotions, and sensations.