Everything but the eyes covered: the same eyes.
Faces everywhere
Wollaston’s eyes
Where is each man looking?
They seem to look different ways, but the eyes are the same, printed from the same engraving.
Why? Your brain works out where someone is looking from their eyes and the way their face is turned together. William Wollaston showed it in 1824 with these drawings.
Picture: William Hyde Wollaston, 1824 (Wellcome Collection), CC BY 4.0