The Leveler by Amin Saadat will ensure that you won't over-think the positioning of your pictures on the wall. Hanging photos and art can turn into a tricky exercise once you've been scrutinizing their alignment for long enough.
Developed by the Animation designer, this clever gadget is a corner-mounted circle with a pair of dials that takes your own judgement out of the equation. You can set it up on either the right or left top ends of a picture frame and watch as the inner ring locates a perpendicular path to the floor with a clear arrow indicator. Two other arrows can be found on the outer dial of the Leveler. These align with the first when the print is pinned up straight.