Where is the hook?

We use the lower pair of stereo cameras to identify objects and find out how far away they are. The stereo cameras work just like your eyes. Each camera sees a slightly shifted image, and by calculating how much objects shift in our field of view, we can tell how far away there are. Using that information, we generate a disparity map which is just a color coded image of how far things are away from us. Can you spot the hook?