Dear Light Walkers:

I’ve been thinking a lot about our understanding of binary categories ever since several months ago I listened to an interview with a man who is blind, having lost his vision in his mid-twenties in an accident. He mentioned that he did have some shadow vision—he could make out shapes and forms, but they lacked definition and color. When he described what his poorly functioning eyes could ‘see’, he expressed his surprise that many people told him he wasn’t really blind. He said that we think of blindness and sight as a binary relationship, when less than 20%