To me, the facinating thing about Xenophora and their attachments as a
disguise in Guaymas, Mexico was the fact that most of them had a
complete covering of grassy algae that hid everything. To find them you
looked for lumps of algae.
The same thing applies to other schemes that are generally taken as
camouflage: If it is a disguise, why cover it up with something
entirely different?
Aloha,
Wes