I really wanted to come up with something new and inventive, and I thought about using the keyboard in... different ways. This was originally intended for you to operate with your fist, without actually thinking about where your hand is but just rolling it around on the keyboard, but midway through the project, I realized most keyboards don't allow you to press more than a certain amount of keys at a time. Which is a major bummer. But hey, I think that this could be the start to a really creative game! (As in, using the keyboard like this for something... not specifically for the marble, but for... some...thing...)