https://www.nytimes.com/2013/05/15/arts/design/record-auction-price-for-barnett-newman-at-sothebys.html
http://www.barnettnewman.com/onement-vi/
https://www.widewalls.ch/cy-twombly-paintings/untitled-1970/
http://www.sickchirpse.com/rothko-untitled-yellow-blue-painting/
http://www.mark-rothko.org/number-14.jsp