tetraspace (via https://colab.research.google.com/drive/1go6YwMFe5MX6XM9tv-cnQiSTU50N9EeT?fbclid=IwAR30ZqxIJG0-2wDukRydFA3jU5OpLHrlC_Sg1iRXqmoTkEhaJtHdRi6H7AI#scrollTo=02ZbcWw5YYnU)
a Schelling point for those who seek one
