I have an impromptu version for this I will explain later.
Ok not sure if all of you know of this biut there is this mesh material that when liight is shined on it one way the luight travels right through the material showing what is behind it. But when shined on it through the other way it is opaque and projects the image printed on it.In this case the image is a card.so the mesh card when the light is shown through the sode with the image printed the image will slowly begin to appear from a distance it will be exactly like it was in mid air. or from the heat of your hands it could warm it up porducing an image.
Impromptu:
of course the gimicked versin will be much much much more visual but this is also good. I do not take credit for this at all. all you do I do the rub a dub vanish then ten kai palm a card then place it under ur hand
HUH IT THERE! haha