Parallel convergence

What do you think about parallel convergence?
Like it, love it, can do without it?

I mean you have one foot on one railway rail, the other on the other and there you are standing on two unbendable, totally straight steel bars.
But there they go getting closer and closer even closer until someway off they touch.
Parallel convergence.
Warning, if you are trying this at home, trains touch too.

Artists had a hard time with this smaller, smaller touchy thing.
From the beginning of time everything was drawn 2D
Think European cave painting, Egypt, early Russian/Greek heads.
All painted side on and flat as primordial pancakes.

This incredibly simple and elegant solution to portraying depth appeared in 14th century Greece and then changed art forever. The dot that ate the lot.