Sometimes I think of my friends as a vector space over GF(2) where each entry defines what we have in common.

  • email, phone and other providers
  • clothing with more or less witty slogans
  • discount cards for transport, food and culture
  • (the fact that we have an) employer
  • brand and operating system of our computers and phones
  • number, kind and brand of our bicycles
  • countries we've visited and lived in
  • passion for lists