How to practice “In the seen will be merely what is seen”

*"In the seen will be merely what is seen”* I’ve red this http://theeyeofdhamma.blogspot.com/2013/10/ditte-ditta-mattan-bhavissathi.html?m=1 I’m still not sure how I should apply & practice this in real life? For an example, if I see some delicious food, instantly, craving naturally occurs and think “that looks yum”. After that, with a tiny force, I think that, this is how my mind is trying to objectify the feeling and remind the example given on above post: *“An example given is the image (or shadow) falling on water when one looks into a pond. We cannot interact with this image by touching or smelling and it appears when we look into the water and disappears when we move away. If we try to touch it we can feel the water but not the image.”* I’m really confused how to put this in daily life. Really appreciate if anyone could guide me..