The Henry O. Studley tool box is shown in the photo. When closed and hanging on a wall it's 39 inches by 20 inches and 9 inch deep. It opens up to become a 40 inch by 40 inch tool chest.
It's made out of mahogany, rosewood, walnut, ebony, and mother of pearl (Henry was a piano maker). Each tool fits snugly into its space, often with an audible click as the tool snaps into its closely-fit cavity.
[Thanks to Gadgets.BoingBoing.net]