Mount Pond: Oil on Water
More Damascene a sheen in large.
Swan from above
Echoes of Benjamin Franklin's membrane (bio)physics experiments? He was interested in the use of oil slicks to control surface waves and wakes around ships, and performed experiments on this very pond when visiting a friend in London/Clapham (see below).
My other Mount Pond pics from today are here (or right from this tufty tufted duck).
On Franklin's experiments:
Franklin B. Of the stilling of waves by means of oil. Philos. Trans. R. Soc. Lond. B. 1774;64: 445–460.
Giles C.H. Franklin's teaspoonful of oil — Studies in the Early History of Surface Chemistry, part 1. Chem. Ind. 1969: 1616–1624.