Cactus - Black And White

In the winter I tend to visit Phipps Conservatory quite a bit. For one thing....it's warm in there! And their array of flowers and plants allows one to escape winter, if only for a short time.

Recently I seem to find myself drawn to the cactus room, and, because cacti and succulents are more about line and shape (to my eye anyway), I enjoy portraying them in black and white: