This demo has me thinking about the possibilities of transparent displays. We need one of these in Gadgeteer module form!
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Go ahead, make one.
The display aspect is very cool. But I’m wondering how they are scanning the area … is the device with the display doing it? Is there something else with a camera doing it?
Yea, I think this is just part of a PC based system that probably has a camera involved.
that looks like the 4D systems transparent display. http://www.4dsystems.com.au/product/1/5/4D_Intelligent_Display_Modules/uTOLED_20_G2/
they have lots of interfaces like uart etc so it wouldn’t be hard to interface. making it do something useful would be though 
SparkFun has a 2" one…
https://www.sparkfun.com/products/11788
Not cheap. Perhaps a little early to suggest building one as a module…