Theatre St Georges
Here is the Theatre St Georges in Paris. Have a close look at the picture - things are not as they appear!
OK, this really is a theatre, but much of what you see is fake - it has been painted. This is a spectacular example of trompe-l'œil, and maybe it is appropriate that it is in Paris, since trompe-l'œil comes from the French, with tromper meaning to deceive and l'œil meaning eye.
If you think about it, a theatre is unlikely to have so many large windows - you need to be able to make the inside dark.
Have a look at the next page, and you will see what the theatre really looked like, before the artist got out his paint and brushes, and whisked up this little confection.