The construction of the eye follows very precise laws. The senses are ordered according to their importance. And according to how much energy must be *eaten* by the *eye* for an individualto receive a particular sensation. All of the sensory data input is *food*.
In the Ancient Egyptian measurement system, the EYE OF HORUS represented a fractional quantification system to measure parts of a whole. [ Get a book on Egyptian stuff or scan the internet for Egyptian Math see for e.g. "Understanding Hieroglyphs" by H. Wilson, ISBN 0-8442-4604-2 ]
The entire eye measured 1 heqat. And each of the parts of the eye measured
fractions of the heqat.
These are the parts of the EYE and their corresponding associated fraction values:

Touch 1/64 Heqat. This part of the EYE represents planting a stick into the ground. Like planting a stalk that will take root. The Earth represents touch. Plant- ing itself represents physical contact and touching
Taste 1/32 Heqat This part of the EYE represents the sprouting of the wheat or grain from the planted stalk. It is the food we put into our mouth. And so represents taste. Taste is also = Touch + Shape. That is to say, the different tastes we experience come from touching different shapes. So, touch is more a fundamental sense that taste.
Hearing 1/16 Heqat This part of the EYE represents the EAR. The figure points towards the ear on the face. Also, it has the shape of a horn or musical instrument. When we Hear a sound or combination of sounds we find this to be pleasing or unplesant. The sound has a taste for us, causing a preference. Sound requires Touch + Taste and so is a combination of the lower senses.
Thought 1/8 Heqat This part of the EYE represents thought. We often use our eyebrows to express our thoughts. And this facial feature is closest to that part of the forehead we associate with thinking. We raise our eyebrows to express surprise, for example. Thought = Touch + Taste + Hearing. If you think about it. Thinking is a kind of surpressed sound. The language we think in is like the *touch* of muscle prior to giving voice. And of course, we have a *taste* for different types of thoughts.
Sight 1/4 Heqat This is the pupil of the EYE. And so no more needs to be said. It represents seeing, or the sensation of light.
Smell
1/2 Heqat
This part of the EYE points to the nose. It even looks like a nose. It represents
the sensation of smell.