@dormouse759 I agree with @sinbad. Sure, all icons are digital abstractions based. The original abstractions were built upon real objects, so there was a physical ground truth representation.
Then we built a new abstraction upon that, which tidied up the rough edges.
20 years on we’re ~15 abstractions down, and the reference ground truth is probably somewhere around iteration ~10. Unless you know what that is, it’s like trying to understand French when all you know is Latin.