Lol... not being as advanced a user as you are shvrdavid , it took me quite some time to understood what you were explaining.

Now I think that I've understood how to project a picture on a wall:

the "Chastity" picture is on a small square almost against the back wall:

Using this material setting

𝒫𝒽𝓎𝓁

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(っ◔◡◔)っ

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