What's better for a couple of artsy parents - including a Graphic Designer geek dad - than a color book Pantone: Colors.
The book highlights 9 different colors and 20 shades of each.
N is totally into any book in general that will make us test his knowledge of anything (colors, shapes, numbers, letters) and A just thinks the different shades, and their different names are fascinating! She asks us to read them over and over and gets a kick out of thinking & talking about them!
From other reviews I've read the age span of interest in this book goes for a long time. Some even mentioning their third graders interest! Love it. Highly recommend adding it to your collection even if you don't consider yourself "artsy". :-)