Furnished content.
(from Lumberjocks.com)
A very, very simple project but this has proven itself to be a really handy sanding block. It's just some pine with cork facing but having the sides taper means that you can hold your sandpaper taut without much effort or fatigue. Pulling on the paper with your thumb and middle finger while pushing with the index keeps it tight and in place. It's also easy to keep shifting the paper for a fresh surface. I find the best dimensions are 4x2x about 1 high. Sides are tapered by 15 degrees.