An illustration of Piranesi's perspective trick, where the same transformation is repeated for each part (each letter in this case).
Compare with a 'true' perspective (below)

@brunopostle do you know where I can read more about this? I really like Piranesi's work, but have never read about the process of making it.

@federicomena I don't know anywhere simply describing this aspect of his technique. We were trying to reproduce it for Hugin when I discovered the 'Panini' projection, but we did lots of measurements and concluded none of these artists actually used our 'Panini' projection.

@federicomena Piranesi and the others knew perfectly well how to draw a 'correct' perspective, but it didn't always suit their purposes, so they cheated. The 'trick' in the image above is simply to give each letter the same distortion, but scale them up in a series.
The result is much more legible than a true perspective, they used it to draw collonnades of arches, buildings in a row etc...

@brunopostle thanks, this is really interesting! I'll have to look closer at those drawings.

@federicomena I eventually had a chance to try this in g'mic. The first image is a true perspective done in GIMP, the second is the same view using Piranesi's perspective trick - the Piranesi version is much more legible

@brunopostle 😮 wow, this is pretty amazing. I'm beginning to understand why when I draw something from memory, the perspective seems weird (conversely, when I draw perspective lines and everything, it looks like everything is scrunched in the background).

@federicomena yes 'true' photographic perspective is a bit weird, artists tend to avoid or try to fix these distortions

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