You see, Dennis is red/green colorblind. Which means that if you and I see red flowers in the green grass, all he can see is green. Or if he sees something purple, he will call it blue. I always wondered how exactly Dennis sees things. And now I know.
I discovered this website that alters your pictures so it appears the way a person who is colorblind would see the exact same picture. Below are two pictures, the first is a picture that I took. The second, is the way a person with red/green color blindness would see it:Dennis tells me that these pictures look the exact same to him. Get out of town! Crazy. This totally explains why his favorite color is brown; it's the only color he knows! The weird thing is, he can tell me pretty accurately what colors these balls are. I'm floored. I'm amazed.