That’s an illusion created by the way it is being held and the rounded edges of the bottom of the glass. It’s just our brain interpreting the optical information in the wrong way. As you can see in the other picture, the bottom is not actually convex.
That’s an illusion created by the way it is being held and the rounded edges of the bottom of the glass. It’s just our brain interpreting the optical information in the wrong way. As you can see in the other picture, the bottom is not actually convex.
I’m just gonna drop this link here, because I actually have experience refurbishing Mason jar seals and mechanics…
https://youtube.com/watch?v=YFn_ed6vRwM