Fugacious

Restless, shifting, fugacious as time itself is a certain vast bulk of the population of the red brick district of the lower West Side. Homeless, they have a hundred homes.

Watering of the eye, conjunctival congestion, distinct catarrhal conjunctivitis, and deep-seated scleral congestions, sometimes fugacious, and often accompanied by intense headache […]

It may be that Redford's fugacious nature is not so mysterious, that it is studded in the artwork of the labs and the very stones of Sundance.