And inventing ‘scratching a plan into something so people understand it’ is not an Einstein level invention. It’s immediately graspable by small children so it

And inventing ‘scratching a plan into something so people understand it’ is not an Einstein level invention. It’s immediately graspable by small children so it seems likely that it’s something humans have been doing for a veeeery long time. These ‘blueprints’ are preserved because they were carved in rock. All the thousands of years of prior art of scratching lines in the dirt are lost to time.