It’s not something that I’ve spent a lot of time thinking about, but after looking at ABC Button I didn’t realize that in a systematic way you could create any letter with a 3 x 3 base unit grid. There may be other buttons out there that have nine holes in them, though I haven’t seen them before. It’s a really cool idea. Having all those holes in the button allows you to create some great words. If you happen to visit the ABC Button: Der Button you’ll not only be able to see some images of the buttons in action, but you’ll also be able to download the typeface that was influenced by the buttons for free.