For years we have wondered about the origins of the two items below. They have clearly been made with precision and some complexity. There is a net of what is possibly some foil material inside the glass (in the expanded condition the material looks grainy, like sand) and the bases are finely polished. The taller one is 29cm high and the wider one is 12cm diameter at the widest.
The suggestion on some internet auction sites of design by Giulio Radi for AVEM seemed unsatisfactory. Now, of course, we know they are from the mid-1960s by Josef Hospodka for Chribska Glassworks. Thanks, everyone.