Aerial Burton has used a plasma laser to float a 3D image in mid-air.
At the moment it's very early in the development cycle, but it shows that light can be viewed without the need to bounce it off a surface. Until now any "hologram" examples have required glass, smoke or water to bounce light from.
More information is available here:
http://www.appy-geek.com/Web/ArticleWeb.aspx?regionid=4&articleid=31377103
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