Here's another to add to the forest of bookcase trees. Designed by Jordi Mila, the Wisdom Tree looks like a tree translated into Seuss. It can hold about 100 books, which is a pretty generous load, and the supports (those knobby bits) are covered in leather, which adds an unexpected touch of warmth. You can read more about the Wisdom Tree here.
Materials: Wood, leather, acetate lacquer; comes in red, white, and black
Measurements: 47.63"L x 10.02"D x77.55"H