In the depiction of a row of identical columns parallel to the plane of a perspective drawing, the outer columns should appear wider even though they are farther away.
Leonardo's Paradox
See also
Perspective, Vanishing Point, Zeeman's ParadoxExplore with Wolfram|Alpha
References
Dixon, R. Mathographics. New York: Dover, p. 82, 1991.Referenced on Wolfram|Alpha
Leonardo's ParadoxCite this as:
Weisstein, Eric W. "Leonardo's Paradox." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/LeonardosParadox.html