It's abstract, and it's an optical illusion.
Much of modern art that's labeled "abstract" can confuse a viewer who doesn't know what the artwork means. These abstract photographs by Nick Albertson have a handy key that explains what they mean, which I've included at the bottom of this post. It will tell you just what to think of each one.
More art here: Nick Albertson>>
Toilet paper cube, straws, sandwich bags, rubber bands