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The half mirror is self made. The glas is cut from a photo picture frame, and a sun shield / privacy foil was applied.
The following animation shows, from the side, the light-path for the upper half of the half mirror. The blue lines are the retroreflectors, the green line is the half mirror.
<gallery mode="packed-hover">
image:HoloDings1.jpg
image:holodings_led_display_3.jpg
image:holodings_halfmirror.jpg
image:holodings_retroreflektor.jpg
image:Hackffm Gui.gif
</gallery>
http://www.k2.t.u-tokyo.ac.jp/perception/AIRR_Tablet/index-e.html
