A Wine Bottle’s Indentation
At the bottom of every wine bottle is a deep indentation. This isn’t there for aesthetic reasons. It’s called a punt and it was originally placed there because in the olden days, the bottles were handblown. So, the bottom was pushed up to prevent the formation of an outer nub that would make it impossible to balance the bottle on a table.
Tire Treads’ Rubber Bumps
Most people are oblivious to them, but there are rubber bumps or raised edges in the groove of car tires that aren’t there as part of some design. They’re there so that they can warn drivers when it’s time to change the tires. If the edges are smooth, then it’s not safe to drive with those tires.
