We think he may be color blind. I have several male cousins on my mom's side of the family that are color blind. He has the hardest time with colors- he'll just call everything orange or blue. Which is normal, but I mentioned it to DH who then freaked out like it was something horrible. So we did a color blindness test for kids- they are supposed to see shapes like a star or a circle. DS definitely knows shapes and when we showed it to him all he said he saw was dots (which is what the picture is made of). It's totally unscientific and DH probably administered it wrong, but I'm sort of intrigued.