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Soulskill from the bring-an-umbrella dept.
An anonymous reader points out work at the University of Bristol into interactive, 3-D displays created by projecting light on misted water.
"These personal screens are both see-through and reach-through. The see-through feature provides direct line of sight of the personal screen and the elements behind it on the tabletop. The reach-through feature allows the user to switch from interacting with the personal screen to reaching through it to interact with the tabletop or the space above it. The personal screen allows a range of customisations and novel interactions such as presenting 2D personal content on the screen, 3D content above the tabletop or supplementing and renewing actual objects differently for each user."
No amount of careful planning will ever replace dumb luck.