I want to know the answer to the following question:
Are there any visual signs of tracking when listening to a record?
All the background I'm provided with is that "During a quiet passage, woofer speaker cones can sometimes be seen to vibrate with the subsonic tracking of the stylus, at frequencies as low as just above 0.5 Hz (the frequency at which a 33 1⁄3 rpm record turns on the turntable; 5⁄9 Hz exactly on an ideal turntable).". Is that enough to answer the question?
Answer: yes