I wanted to post this to the thread dedicated to pre-PID references but I couldn't find it. This is a piece of pottery from ancient Egypt that reminds me of that scene in Help! when a shrunk Paul ends up inside an ashtray
"Figure of a man in fetal position inside a frog. Naqada I; Fourth Millenium BC; fired clay; H.8.8cm W. 25.3cm D.11.3cm Leiden (NL), Rijskmuseum van Oudheden, F1962/12.1
The interpretation of this piece is still unresolved. The man lies in fetal position in a bowl, which has been identified as a frog due to the images on the handle-like long sides. In analyzing the bowl, scholars considered it to be a ship in the form a a frog, to be understood as a means of transformation of the deceased. The deceased is apparently lying inside the frog in anticipation of resurrection, since the frog goddess was later considered to assist with childbirth".
From the book : Egypt The World of the Pharaohs. Regine Schulz, Matthias Seidel. H.F. Ullmann ISBN 978-3-8331-6000-1