brightly coloured, thin metal/plastic pipes. Cheap & effective.
As a long time opera user who works in web development I am mostly going to miss the dragonfly development tools. They were much cleaner and easier to use than firebug and the development tools built into chrome. Not really sure Opera serves any purpose at all other than being another option any more. Long gone are the times they would implement new features and other browsers would copy them months later. Can't even figure out how to use mouse gestures now.