You see, proteins, as I probably needn't tell you, are immensely complicated groupings of amino acids and certain other specialized compounds, arranged in intricate three-dimensional patterns that are as unstable as sunbeams on a cloudy day. It is this instability that is life, since it is forever changing its position in an effort to maintain its identity—in the manner of a long rod balanced on an acrobat's nose.

Triangle: The currents of space; Pebble in the sky; The stars, like dust (ed. 1952)