It seems (from my experiments) that recognition treats all rotations of objects equally. So for instance it recognizes right bracket as left if drawn backwards. I think there should be a caveat warning there.
I think it's a neat toy, but frankly I don't understand what attracts GUI designers to gestures. They seem lot more complicated than just buttons (even if you would have to push an extra button to get the menu), they are not obvious and you have to learn them to do correctly. Am I missing something?
I like gestures for the same reason I like keyboard shortcuts: you don't have to aim. There's a tradeoff in UIs: large number of targets with few actions, or large number of actions with few targets. An example of the former is a typical web page, where every link is a target and the only actions are open and open-in-tab. An example of the latter is vim, where there are only a couple targets (buffer and command bar) and every key is an action.
I think it's a neat toy, but frankly I don't understand what attracts GUI designers to gestures. They seem lot more complicated than just buttons (even if you would have to push an extra button to get the menu), they are not obvious and you have to learn them to do correctly. Am I missing something?