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I always enjoy teaching perspective as an art teacher. It's very fun to deconstruct visual perception.
Examining a door. We know its about 8-9 feet tall. That same door lets say 50 feet from you will look very very small.
So there is the measurement of what we know the door to be and well the door in relationship with the one perceiving.
Then we can ask what makes this door 8-9 feet? Is the measurement intrinsic to the door itself? And what is more valid the measurement or the measurement dependent on the one perceiving.
But then it struck me. Both actually don't have referents, yet both require conditions. A door must be measured and that measurement must be in relationship to other measurements. There are no free standing measurements. A foot has to actually refer to something to be a foot.
And the size change based on location only has relevance to the held concept of measurement. The further away I go, the smaller the door. The closer I go, the bigger the door. At some point based on where I stand even the door doesn't seem much like a door. It could just be a field of see through glass material. Or a blob of color.
Its very curious how we set up all these reference points. Here and there. Here being the sense organ of the eye and there being the object. This creating the sense of depth and space and even time. Yet all of it interdependent, hence empty of inherent existence.
So even a door be it a symbol in the form of conceptual expression or non-conceptual sense data require things other than itself.
And in that requirement is its lack of intrinsic identity. Doors work just fine.
If we study basic perspective in art we can see how an artist can express the illusion of three dimension on a two dimensional surface. Giving a subjective reference point and various objects relating within the space and time of the image presented.
This is also directly how the body and mind work together to construct the whole of perception. Except instead of paint there is concept and instead of canvas there is consciousness. When those two meet we have the world of perceptions.
The whole enactment of dharma is presented to see this correlation. Not necessarily to make a better perception, though that can be relatively useful. It is to recognize this process and find liberation in that direct seeing.