Sometimes, eventually, some dreams do become real. In this case, my dream of creating a programmable system that would enable the tangible and audible interaction with small holograms.

The resulting novel technology is intended as a means for new research into surface-orthogonal fingertip control actions.

While such control actions unfold, a range of stimuli are computed in real time:
• touch stimuli (including passive touch, active touch, haptics, and manipulation);
• visual stimuli (in glasses-free stereoscopic 3D, and at the same spatial scale as touch);
• auditory stimuli (including musical applications).

Ghostfinger is introduced in this paper.