What does this mean?

That, my friend, is exactly the question you have to ask.

ancient engineer: hey i want to design something tall for the priests but every time i build anything really high up the whole fucking building falls over

ancient engineer 2: have you considered stacking the levels so that it cant fall over because the top is smaller than the bottom, also putting the keystones in places so the base doesnt break

ancient engineer: your’e a goddamn genius. here’s a key to my clay + thatch hut and fuck my wife