The phrase "rat nest" typically refers to a mess or a disorganized tangle of objects or ideas, and it can be helpful to have antonyms for this concept when trying to describe order, cleanliness, or simplicity. Some antonyms for "rat nest" might include "neat and tidy," "organized and structured," or "streamlined and efficient." Other options might include "calm and peaceful," "minimalism and clarity," or "harmony and beauty." Ultimately, the choice of antonyms will depend on the context and the specific connotations that one wishes to evoke, but having a rich vocabulary of opposing concepts can be a valuable tool for effective communication.