wheels within wheels - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Complex interacting processes, agents, or motives, as in It's difficult to find out just which government agency is responsible; there are wheels within wheels. This term, which now evokes the complex interaction of gears, may derive from a scene in the Bible (Ezekiel 1:16): “Their appearance and their work was as it were a wheel in the middle of a wheel.” [c. 1600]