The Sieve of Eratosthenes

At Escondido Mall, on the Stanford campus.  Cycled over there yesterday morning, to find that my usual coffee source, Coupa Cafe at the Green library, was open.  
In extra, view down Palm Drive towards the Memorial Church. 

https://www.stanforddaily.com/2014/02/03/di-suvero-installation-moved-to-escondido-mall/