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[[DateiA DIY hologram project based on AIRR ("Aerial Imaging by Retro‐Reflection") developed by Prof. Yamamoto. Using two optical component, if you count the observers eyes it's one more :Hackffm GuiD, this optical system can refocus light sources in mid air, hence you get the impression of a floating image in mid air. The main optical components are a half mirror (aka magic mirror) and a retroreflector. A retroreflector is like a mirror, but it reflects always the photons back to the light sources. For example, all the street signs utilises retroreflectors as a foil to get higher visibility. A similar foil is used for this project, but with a better optical resolution and reflectivity value. The half mirror is self made. The glas is cut from a photo picture frame, and a sun shield / privacy foil was applied.gif|200px|thumb|left|Alternativer Text]]