You're welcome:-)

The reason such tiny our even immeasurable differences can work for us is psychological. Because the sound entering our ears is extremely complex, what our brain can do to reduce it to individual instruments, melody, sense of rhythm and even sense of sound quality is astonishing. We can't remember so much detail. When we expect a difference, we trick our minds to analyze the sound again and we can make new notions about the sound. Sound doesn't change (or changes very little), but we do.

Try to visualize how the palm of your hands looks like, for example. Then look at it and compare to what you imagined. The difference in the level of detail between our memory and the real- time emotive experience is crazy. If someone told you're developing some mild skin condition, how easy would it be for you to find something in that picture that is different to what you remember?