Counting fingers is one of the tricks. Another is to try to go back to the room/street/place you just came from, when you do, it will be changed to something el

Counting fingers is one of the tricks. Another is to try to go back to the room/street/place you just came from, when you do, it will be changed to something else. This is also what AI video generators fail at. Another which I discovered myself as a kid as a first sign was that if I go back and reread the same text it never stayed the same. Discovered other lucid dreaming signs later. The brain continuously generates/halluicnates stuff while dreaming, keeps too little context.