Photo of several volumes of "Description des arts et métiers", the encyclopedia used by Jacob Olie in his classes at his self-founded "ambachtsschool" or vocational school in Amsterdam. Other volumes lie open on the table. The backs of the bindings show where Olie's great-grandson's dog slept against them when they were stored along the wall of his bedroom, leading him to decide to give the set to the University of Amsterdam, the successor to Jacob Olie's "ambachtsschool". Article on website of Bijzondere collecties