Post-touch hasn’t found the killer use case that the mouse found with GUIs and the touchscreen found with mobile web browsing and apps — but it’s not for lack of trying. We’ve had a flood of prototypes, demos and art projects, any one of which could flourish into an industry — that is, once every laptop comes with a near-field depth camera. As for which will take off…it’s anyone’s guess. But some guesses are better than others.

Read the opinions by Michael Buckwald, CEO of Leap Motion; Doug Carmean, Researcher-at-Large for Intel Labs; James Alliban, interaction designer; Andrew Hudson-Smith, Director of the Centre for Advanced Spatial Analysis; and Casey Reas, co-creator of Processing.