Regarding positive dissociation, while I agree with most of what has been said here about experiencing and learning about empathy and other human feelings from watching movies, reading books, looking at beautiful pictures (all of which I love to do), in addition to observing the art of others, I think positive dissociation that helps us learn and grow can also come from doing--from actively participating in some creative activity ourselves--creating our own visual arts, or dancing, singing, doing martial arts.
Using our creative powers in these active ways takes learning how to focus and be in the present, be aware of our bodies, our thoughts and emotions and how they interact. Physical activity that is done creatively requires intense self observation; even when we are learning new skills and not doing them very well they can be enlightening, helping us learn about ourselves. When people are deep into their practice they often describe a type of positive dissociative state, "being in the zone,"--the rest of the world falls away and they are in that perfect place where mind, body and spirit are functioning in harmony.
I use to love to do pottery using an old fashion kick wheel. The motion required of the legs to keep the wheel going was repetitive and relaxing. Centering the lump of clay on the wheel required one to obtain a "centered" physical and emotional state or the clay would collapse as you were trying to create a pot. I rarely reached that centered place back then and made a lot of ash trays even though I didn't smoke
as you can usually salvage an ashtray-like form from dead bowls and vases! Although I never got good at it and haven't done it for more than 35 years, doing pottery taught me how negative emotions buried in my body would cause me to be tense, unbalanced, and ruin my creations.
So, I am interested in hearing about other people having positive dissociative experiences by creative doing as well as seeing.
shellycheval