The five colors cause man's eyes to be blinded.
The five tones cause man's ears to be deafened
The five flavors cause man's palate to be cloyed.
Hard to obtain merchandise causes mankind to do wrong
So the Sage concerns himself with the abdomen and not the eyes
Therefore, he rejects the one and chooses the other.
This is from Lao Tzu: My Words Are Very Easy to Understand