I mean, put together a sign that looks one way without glasses, and another way with them.
the 3D glasses used in modern 3D movies have two lenses, one admits only light polarized vertically, the other only light that is polarized horizontally. The projector puts out in 60 frames per second, alternating between horizontally and vertically polarized light frames (each passed through filters that make it so, normal movies are only 30 frames per second).
The normal eye admits light of all polarizations equally.
So basically, what's needed is glasses with two frames, both made to admit horizontally polarized light... And a new painting technique: We need a material that will only reflect, in each colour, horizontally polarized or vertically polarized light, and a printing technique which can cheaply make something like a billboard with small pixels with each polarization, so the naked eye pics up one image, but the individual with the glasses sees another entirely, embedded within he first. (computer programs could be used to design these.)
There's a conspiracy nut inside all of us, and there's a whole world of marketing fun in this if somebody can come up with that paint, that makes the secret glasses give us a new perspective on the world...
Peace.
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