B.A. - Sebastián Zachar
This illustration captures the moment right before re-implantation of removed bone segment after pterional craniotomy. The upside-down view as seen by the operating neurosurgeon (likewise à Hommage a Georg Baselitz, who was drawing like this all his life).
As the author of illustration I have given permission and consent to be loaded in Wikimedia Commons with Creative Commons Attribution Share Alike 3.0.