Extraplanar Obelisk is a term from Ghostbusters: The Video Game (Stylized Versions) that explains how architecture, engineering, and geometry come into play in the occult.
According to Tobin's Spirit Guide
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When gifted with the mad insight of the occult, an architect can imbue certain structures with peculiar geometry that resonates with the spirit world. When these angles and dimensions are brought together, they channel spirit energy like a radio antenna, focusing it in a specific location dictated by the form of the structure. This is a useful way for sorcerers to gain energy to fuel their various unsavory rituals.
Ivo Shandor, an occult practitioner and architect in the '20s, used structures like these to great effect. One of these focal points in New York caused an interdimensional cross-rip wherein we had to battle the demigod Gozer and send him back to the abyss. Good times, indeed.
Don't try to climb it!
The art page can be found in the Museum, during the "Show Time" section. It is hidden inside an object in a corner of the main exhibit room.