On YouTube I saw Matt Parker and Adam Savage do videos about how to construct geometric shapes in three dimensions. I tried the same with flat shapes in both 2D and (pixel art) isometric perspective. Since pixel art is a crude representation of reality, I had to fudge a lot to make it fit.
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pixel art (200 by 200, 8 colors) of a square and a equal-sided pentagon in top view and in sheared (pixel art) isometric perspective