wow, look at those eyes. Check out the info on the flickr page. I have seen his canvas/string/textured paintings, but never a drawing. Tapies, Antoni (1923-2012) - 1947 Self-Portrait (Mainz State Museum, Germany) by RasMarley, via Flickr
Astronomicum Caesareum by Michael Ostendorfer, Instructive manual explained the use of the astrolabe (for calculating the altitude of stars) and other instruments used for computing planetary positions.