Exhibition catalogue, Köstlichkeiten aus Kairo!, Antikensmuseum Basel und Sammlung Ludwig und Museum August Kestner Hannover, 2008, p. 68, nos 15a & 15b.
To see how such a piece might be inserted into a Nilotic landscape, cf. E. M. Stern and B. Schlick-Nolte, Early Glass of the Ancient World, 1600 B.C.-A.D. 50, Ernesto Wolf Collection, Ostfildern, 1994, no. 125. The lotus flower, with its roots in the mud, its stem in the water, and its flower opening up to the sun, was the point upon which the young sun-god Horus sat at the first moment of creation. The lotus flower also symbolises Upper Egypt.