A part of my academic genealogy tree, i.e., a tree showing supervisor-PhD student relation:

Statues in the Warsaw University Library, which present the greatest Polish logicians: Kazimierz Twardowski, Jan Łukasiewicz, Alfred Tarski, and Stanisław Leśniewski - all of them are situated in the above genealogy tree:
The photo is from http://www.philosophy.uw.edu.pl
the photo is from http://www.philosophy.uw.edu.pl.