Coloured Quadrangles is meant as a guide to give access to the tenth book for those who may have lost faith in the commentaries by Thomas Heath, but who shrink from the long wanderings through the Greek text.
Christian Marinus Taisbak recently retired as an associate professor in the Department of Greek and Latin at the University of Copenhagen. He is the author of Euclid's Data - The Importance of Being Given (Museum Tusculanum Press, 2003).