Ajahn Chah used often oil and water analogy to describe the knower and the khandhas,
thats my favorit anology to understand it clearer.
"The heart is just the heart; thoughts and feelings are just thoughts and feelings. Let things be just as they are! Let form be just form, let sound be just sound, let thought be just thought. Why should we bother to attach to them? If we think and feel in this way, then there is detachment and separateness. Our thoughts and feelings will be on one side and our heart will be on the other. Just like oil and water—they are in the same bottle but they are separate".
~ Ajahn Chah, “The Training of the Heart”
I painted this in MS paint (mad skills I have) just to make it more visually. Should I put in something more? Buddhism is just like an educational system so why not paint our way to understanding?