Many, many moons ago (must have been around 2006?) I managed to procure a FingerWorks. It was magic, like holding a piece of computing history!

It allowed a lot of the gestures we take for granted, to switch applications or workspaces, to go back a page, etc. But it also had really cool stuff. You could bind gestures like twisting your fingers clockwise to open a file (just like opening a jar!) or counterclockwise to close it. Pinch and zoom for copy and paste.

I was only able to get a hold on a Dvorak copy. And because the key labels were printed on the board, you couldn’t really change the layout. Getting used to a split layout, no keys and Dvorak at the same time was too much and I had to sell it again. But I’ve been using split keyboards ever since!