The 'apple' is as you said. A shape/colour with a thought labeling it. 'apple' cannot be found in experience.However, is 'an apple' actually known? (Or is it just a label?) Is there really an ‘apple’ here, or only color and a thought ABOUT ‘apple’? Can ‘apple’ be found in actual experience?
I have actually been observing in that manner. Thoughts are seen as thoughts, emotions as sensations with a label, sights as shapes with a thought, sounds as sound with a thought.
To provide an example however:
A sensation on my back - sensation
"The sun is warming my back" - thought
A sound of a playful cry - sound
"My niece is crying or she's playing?" - thought
Pressure in my chest - sensation
"There is anxiety" - thought, sensation (aka emotion)
Fingers typing on the screen, text appearing on a white background - sight, colour
As mentioned earlier there is a lot less noise today. Moments with my partner are much less sticky than they usually are. We were having a little argument today and I was much less reactive. Everything was experienced the same but there was the awareness of it all. 'Anger' was seen and it soon went away. An understanding is here which is felt. A kind of knowing that experience is happening and a feeling of being is present. An awareness of I.

