I think it would be an interesting conceptual episode to deal with the interaction between the seeing and the blind, and find a way for our problem character to explore the different ways to explain what seeing is like, or how the senses can be conveyed in alternative means. Think of it as a synesthesia episode!
Our problem character is hosting a foreign exchange student at his/her house for a night. Suprise suprise when the student ends up being blind.
A kid and his parents are visiting his blind grandmother.
A kid loses his glasses and has to go through a school day without them.
The artists could be musicians who try to convey the idea of color/vision, and artists who portray other things than the visual with their art.