At this point in my design I had decided on the basic idea and shape behind my design. An hourglass apeared to be the best way to create my lighting device as explained in my notes

By now I had done plenty of sketches exploring the idea, but As for the shape of the flasks I wanted just a basic erlenmeyer flask. unfortunatly its hard to find an unmarked flask and I didnt have enough time to hve it glass blown at the facilities in kelburn so I was going to have to make do with something else.