Does any one know of any examples of strange inscriptions on birds eggs?
I meant spontaneously and unexpectedlyDo you mean as a deliberately-created art form, using empty egg shells, or spontaneously and unexpectedly?
Or something else?
A strange and haunting use of eggs is the registration of a circus clown's facial makeup, effectively registering their characteristic 'signature face' as a miniature shaped portrait. This was made reference to at the original Charlie Cairoli memorial area within the lower galleries of the old pre-Merlin Blackpool Tower, and the Clown Face Signature Register itself may be in London
http://www.futilitycloset.com/2014/05/09/the-clown-egg-register/
ThanksThere is an account of 'The Comet Egg of Rome', which in 1680 apparently showed an image of ....a comet, which was visible at the time, but it wasn't clear whether the image was on the shell or inside the egg.
Yellowhammers have strange markings on their eggs which I am sure could randomly be interpreted in all sorts of ways.