Lots of kids toys are brightly colored. Lots of adult tools and things are dull colored. The baby is starting to learn that when we put something in front of him, it's usually because there's a more "interesting" (i.e. dangerous or breakable) thing behind it. In a way, I think we're training him that brightly colored objects are boring and dull colored objects are fun to play with.
I may have to go buy a neon green keyboard soon :)