Clown faces painted on eggs at the Clowns Gallery-Museum, London.
Bult kept his collection at home and occasionally loaned it out for shows.
He created about 200 eggs during his lifetime.
Only those working clowns with developed visual identities are allowed to have their faces painted on eggs.
New clowns, young children, and non-performers do not make the cut.
Clown eggs are kept at only a handful of locations around the world.
Both collections are open to public.
Stan Bult working on an egg.
Unlike the UK collection, the US egg collection is currently in storage and not publicly visible.
Rarely do clowns venture to copy each other because each clown want to look different for distinguish themselves.
The clown eggs themselves do not comprise the registry.
Photo credit: Luke Stephenson
