Even mathematicians, who in some sense are the freest of all thinkers, literally couldn't see not only the sea slugs around them, but the lettuce on their plate -- because lettuces, and all those curly vegetables, they also are embodiments of hyperbolic geometry.
Chiar si matematicienii care, intr-un anumit mod, sunt cei mai liberi cugetatori, efectiv nu au putut sa vada, nu neaparat echinodermele de langa ei, dar nici macar salata din farfuria lor, deoarece salata si toate acele legume incretite, sunt si ele intruchiparea geometriei hiperbolice.