For what I saw, the input screen always seems to be the same and in the same location, thus the input method is spatial. That is, you learn approxximately how far each segment is from your handgrip and you can then whirl your finger around the correct quadrants to produce letters, even without looking. Pretty much how you operate a keyboard once you correctly learn the locations of letters.
A gestural interface would allow you to do, well, gestures. A gesture is like a vector: it has no location. You might learn that 'e' comes from "starting from top, two segments to the right" but that gesture wouldn't have a meaning unless you start from the correct location in the screen space.
For what I saw, the input screen always seems to be the same and in the same location, thus the input method is spatial. That is, you learn approxximately how far each segment is from your handgrip and you can then whirl your finger around the correct quadrants to produce letters, even without looking. Pretty much how you operate a keyboard once you correctly learn the locations of letters.
A gestural interface would allow you to do, well, gestures. A gesture is like a vector: it has no location. You might learn that 'e' comes from "starting from top, two segments to the right" but that gesture wouldn't have a meaning unless you start from the correct location in the screen space.