A piece, perhaps a vase, something traditional, white porcelain.

Allow for the viewer to trigger a projection so that the vase appears to have varying, different prints on it.

The trigger could be proximity or location, or it could be sound or hand placement.

I think the hand placement could be interesting if the glass encasing it was also in the shape of the vase, like a plasma ball is encased in glass and reacts to hand gestures.