Also, if you're a glass installer, you might feel its a best practice to put the heavier end on the bottom. It'll make the pane feel more stable because being

Also, if you're a glass installer, you might feel its a best practice to put the heavier end on the bottom. It'll make the pane feel more stable because being top-heavy is like asking for gravity to take your glass and shatter it. With today's production methods and quality control, we really don't have this issue. Glass panes are pretty consistent, but from the point of view of some 18th century carpenter, you probably had to deal with a lot of inconsistent glass panes.