Ghosts of Departed Quantities
Berkeley's jab at Newton's infinitesimals as 'ghosts of departed quantities', with lim x→0 of x drawn as a ghost.
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Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2016-01-01-ghosts-of-departed-quantities/ (CC BY-NC 4.0)Transcript
George Berkeley, expressing skepticism of Newton's early limit conceptions: "May we not call them the ghosts of departed quantities?" lim_{x→0} x = [a ghost]