Camouflage

This morning Sam was saying that he wished he was blended.

This made no sense to me so I asked what he meant. His response was nocturnal.

Now I was really confused. I tried again. What does that mean?

This was answered by a question, "What is it when you match what's around you?" OOOoohhhh! Now I get it.

The word you are looking for is camouflage.