Later edit - revised art and more text added
Typical natives of Flatland
[from left to right, above then below] A woman of good family (her internal anatomy is so narrow as to be invisible) ~ An obvious member of the lower orders, probably a servant or artisan ~ A poor but honest tradesman ~ A Square, narrator of Flatland ~ Doctor Pentagon, the learned physician ~ Squire Hexagon, a wealthy landowner ~ Sir Sefton Septagon, baronet ~ Count Otto von Octagon of Polygonia ~ A sinister irregular figure.
Note that the colours shown are invisible to Flatlanders and may change completely from one day to the next – their bodies are thinner than the wavelength of visible light and have varying density according to their diet and physical condition; as a result they diffract light unpredictably. All of the anatomy shown, other than the external lines, is also invisible to them since it disintegrates if damaged; some of it has been inferred, often incorrectly.
I'm rather pleased with them, I think...