Have you’ve ever seen the consummate terrine made of vegetables, or seafoods, all perfectly arranged and almost glued together. If you are thinking what I am thinking, yes they could be glued. There is a glue named Activa, a product invented in Japan, a food glue that is made from Transglutaminase which contains a protein named sodium caseinate and is useful in gluing proteins.

http://stefangourmet.com/2013/11/22/improved-octopus-carpaccio-using-transglutaminase/