Full Idea
It is said that Lynceus could see through rock and tree, and a lookout in Sicily saw Carthaginian ships a day and a half away, and Callicrates and Myrmecides are said to fashion carriages canopied with the wings of fly, and write on sesame seeds.
Gist of Idea
People report seeing through rocks, or over the horizon, or impossibly small works
Source
Plutarch (72: Against Stoics on common Conceptions [c.85], 1083e)
Book Reference
Plutarch: 'Moralia - vol 13 part 2', ed/tr. Cherniss,Harold [Harvard Loeb 1993], p.853
A Reaction
A warning from Plutarch against believing everything you hear!