Surface treatment and processing
With our of mother nature given and perfect sense organs, eye and skin we take true and large part of our environment, in particular, for surfaces. Our skin informs our sense of receptors in the active feeling of goods, including the size, shape and surface texture.
So we judge what seems pleasant to us through the haptic perception. Our visual perception allows us to recognize bumps on surfaces in the micrometer determinated area. This perception is influenced by external factors of light as well as personal.