The 'height' of the ceiling is eight feet. [=the ceiling is eight feet above the floor; the ceiling is eight feet high]
It was 'the height of' stupidity to quit the team. [=it was extremely stupid to quit the team]
He was 'at the height of' his fame when he died. [=he died when he was most famous]
(..) Green. And water! There is a ridiculous amounts of clear water. And a lot of crops. It's got everything you need. As long as you're not afraid of heights. Where does the water come from? He pumps it out from deep under the earth. Calls it 'Aqua Cola', and claims it all for himself. (..)2015 Mad Max: Fury Road