Life on a blade of macrocystis kelp at Naples. To me, a kelp leaf from close up looks like an aerial photograph of a city, with space divided up into various areas according to use and inhabitants. In this case, the lacy areas are bryozoans, while the spirals are nudibranch eggs. Some nudibranchs feed on bryozoans, so these may have laid eggs after snacking. The participants might see this as the remains of a Roman orgy, rather than a city.
In Voyage of the Beagle, Charles Darwin wrote of kelp: "Almost all the leaves, excepting those that float on the
surface, are so thickly incrusted with corallines as to be of a