In perfect equilibrium. Weight the brass egg (it unscrews) to create the ideal balance for the shade you choose. Then you are able to play to your heart's delight with the array of brass wheels and flex to find the ideal height for your light. A little bit Caractacus Potts, but brilliantly efficient. 

A fine blown glass tribute to our bivalve friends - and at a push, you could also use it to make very large scalloped shortbread! We don't really advise it though, as it looks much better with a lovely bulb glowing inside it. And anyway, is it scallop or scallop. Neighbours have commenced hostilities over less.