Ulysses is evolving rapidly, and new levels of functionality and interactivity are are planned to be released by the end of September.
Levitation is most fascinating and is actually possible under certain circumstances.
Unfortunately there is no hope for it within the current concept behind Sand As Medium. It would be fun though to control balls jumping at will over the sand and this would open so many possibilities. Sisyphus pushes his famous rock forever up the hill Full story . Sisyphus pushes a ball through a sea of sand. Ulysses can be quite faster when this is desirable.