The supreme headquarters of the Mage’s Association. Clock Tower refers to The British Museum. Shiki’s “teacher” was a pupil of the Clock Tower. The mechanisms of magic and magecraft are only briefly touched upon in Tsukihime, so if you want to know more please check out the novel Kara no Kyoukai (Garden of Sinners - doujinshi/self-published version) in which the main scenario writer Kinoko Nasu explains in more detail.
The stage for this work, the largest of the three branches of the Mage’s Association.
It’s headquarters is in the suburbs of London. For more details, please see the secret files.
⮕Secret File: “Clock Tower,” “Chronology of the Clock Tower”