The thing I like about these two pieces is that no matter how you rotate them (as long as you rotate them in opposite directions), they're always mirror images of each other. This gives a lot of variety and options in hanging them.
Stretching your own canvas is the way to go...it's so much cheaper and you get to customize the dimensions. I'll probably never buy primed, pre-stretched canvas again.
Untitled, 2012, two 18 x 27 inches, acrylic and water on canvas
Horizontal
Untitled, 2012, two 18 x 27 inches, acrylic and water on canvas