Just gonna leave this work of art here:
The Manual of Military Marvels https://m.youtube.com/watch?v=eb_a7u3K8Bo
It looks to be a shot off of the Sir Issac Brock Bridge on Bathurst Street looking west towards Liberty Village
It might be some sort of survey benchmark. If there's one on each end of the bridge, it could be for measuring alignment of the movable section against the stationary section
Making brand new ones from raw sand/ore isn't great when you consider the need to mine and refine those into something useable. Lots of energy and effort goes into that part. The difference is that glass and aluminum are essentially infinitely recyclable, while plastic is often not. It takes way less effort and minimal input of new resources to recycle a glass bottle. Hell, with a robust bottle return system you can skip over the recycling part entirely - just send them back to the bottling facility to be cleaned and refilled.
Fibonacci/Golden ratio = 1.618 Kilometres in 1 mile = 1.609
Conversion is off by less than 1%, not bad at all