A tactile tongue-based, electrical impulse matrix sensor developed by Paul Bach-Y-Rita, rehabilitation medicine and biomedical engineering. Copyright: Jeff Miller 2001

An early tangible user interface: Chess-Master Diamond by RFT VEB Mikroelektronik Erfurt. Source: http://www.schach-computer.info/wiki/index.php?title=Chess-Master_Diamond

Interaction Sprints at Leap Motion: Exploring the Hand-Object Boundary, 2017. Source: https://blog.leapmotion.com/interaction-sprint-exploring-the-hand-object-boundary