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Something less in the novelty realm. Arcane knowledge from the days when I used to fiddle with glassblowing.
As you know (or do now), glass is harder than most metals. Cutting it is done with a carbide edged saw when a cut necessary (normally, you'd break the glass via a moist scratch from tungsten carbide scorer and flick-of-the-wrist). The edge, in either case, can be quite sharp. If no further glass-working is to be done to the edge, it needs to be smoothed. Normally, this is via fire-polishing; a quick dip into a hot flame. When precision is required, the edge is finish ed with a carbide sanding belt (to size) and then smoothed with a belt made of cork.. Cork, more by very localized heating than abrasion, will smooth and polish the edges.
Well, technically, the whole engine didn't come off, just the front cowling.
".45 ACP - because shooting twice is just silly" - JSOP, 2010 - You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010 - When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
Well, there are many things one could do besides illustrating the world. After all, the Internet is referred to as Cyberspace. You're right about the O of course (apart from that they could have used something else than their initial).
BTW, I'm working on a framework for developing UWP 2D games for novice programmers, using XAML and C#, backed up by Farseer Physics and Physics Helper. I just created a space shooter game with very little effort using this framework. Now I feel inspired to make a Browser Wars version of it, having all these round logos shooting at each other.
(I plan to upload the framework as a project on this site sometime during fall.)
I'm just guessing, but I believe it's related to the way browsers where first introduced - connect to the World. The globe. You gain access the "a world of information" etc. I guess that rhetoric stuck.
So, working as a designer for Vivaldi (the browser) and being involved in designing our own icon, we felt it was natural for us to counter this. We're the square peg (in a round hole) of browsers, literally.