"Before we departed from the reasoning of seeing the picture hanging in the air, insegnaremo how we can make the images that we see hanging in the air of any thing that will be the most wonderful thing of all the wonderful, especially with no mirror and no oject the visible [...] But ... let's just see an image in the air in mezo a room, you do not see the mirror, nor the oject of the visible thing, walking around and you'll see the image on all sides .
Giovan Battista della Porta, 1589
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