In The Quantum and the Lotus Matthieu Ricard speaks about meditation, and how the effect of meditation on the mind can be described.
Quote: For example, some authors say that thought is initially like a frothing waterfall, then like a stream with occasional eddies, then like a large river with the odd ripple running over it, and finally like the ocean, whose depths are never disturbed.
A simile is a figure of speech that compares two seemingly disparate objects. It describes by analogy. The word simile itself comes from the Latin word like, and used to also mean likeness, resemblance, similarity (in examples such as: there is no simile between the two). Imitation is a basic learning mechanism. Our acts, words, ideas are first seen, repeated, then modified by circumstance or will. We start by emulating our parents, our friends, our teachers; later on we emulate ourselves, learning and improving on what we have done. The mutual similarity and the gradual alternations of our actions allow for (a perceived?) continuity of personality.