I Make Myself Invisible in Articles by Aleister Crowley.

“I constructed a private temple in a flat in Chancery Lane. It was a hall of mirrors, the function of which was to concentrate the invoked forces. It contained an altar of acacia topped with gold and certain secret symbols and regalia of the Order.” [via, also]

Consider also:

  1. “Then the fun began. We saw–and my teacher was able to identify–hundreds of shapes, weird “half-formed faces” which were thronging the room, marching in fantastic dance about its confines. These were definitely malicious forces, demons, which one had to study and conquer.”
  2. “Some of these rites were often attended with strange results. On several occasions we saw and felt a stranger among us, but when the lights were turned higher there was no one there. Our ceremonies had caused a being to take human form and be seen among us.”
  3. “A girl played the violin during the rites. She was a good violinist, but under the influence of the ceremonies, she was more; she played sublimely, like a supreme virtuoso, in the magical invocations directed upon her.”
  4. “One night, after a ceremony in which a well-known analytical chemist was my leader, I locked the door and went out with him to a meal. When we returned the door was wide open, though the lock had not been forced, and the whole contents of the temple had been thrown about and lay in the wildest confusion.”
  5. “It was at the direction of the head of the Order that I then went to Scotland, to my manor house of Boleskine, which is two or three miles from the Falls of Foyers. My subsidiary object–the principal aim is too sacred to discuss–put into simple language was to gain control over the ‘four great princes’ of the evil of the world.”