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Thanks for the info. You will definitely be interested in this part of John's interview, where he discusses depth and how he approached the problem. It starts at around 9:20 and ends at around 11:25:

https://www.youtube.com/watch?v=NYa8kirsUfg#t=9m20s

Oh wait John does talk about focus! https://www.youtube.com/watch?v=NYa8kirsUfg#t=7m32s

He seems to have not heard of the latest Volumetric 3D display technology: "time-multiplexing": http://bankslab.berkeley.edu/projects/projectlinks/fastswitc... (the bottommost diagram, labeled "Switchable lens volumetric display.", made practical in 2008. The diagram labeled "Illustration of 3 mirrors display" is a bulkier 2004 technology.)

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