A stack of three books is placed on a wooden surface. The books are arranged in a triangular formation, with the largest book at the base and the smallest at the top. The largest book is black with a green and yellow pattern, the middle book is black with a green and yellow pattern and a red heart on the cover, and the smallest book is black with a green and yellow pattern. The books are standing upright, and the largest book is slightly tilted to the left.