"We start out postulating sharp boundaries, such as between humans and apes, or between apes and monkeys, but are in fact dealing with sand castles that lose much of their structure when the sea of knowledge washes over them. They turn into hills, leveled ever more, until we are back to where evolutionary theory always leads us: a gently sloping beach."

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Do you take me for a sponge, my lord? hamlet: Ay, sir; that soaks up the king's countenance, his rewards, his authorities. But such officers do the king best service in the end: he keeps them, like an ape, in the corner of his jaw; first mouthed, to be last swallowed: when he needs what you have gleaned, it is but squeezing you, and, sponge, you shall be dry again. rosencrantz: I understand you not, my lord. hamlet: I am glad of it: a knavish speech sleeps in a foolish ear.

— William Shakespeare