Avguste, That is a good technique to use for stage fright but I think Juufa is just trying to get into his music when he's at home. At least that's what I'm understanding.
Juufa- Yes, you do first have to know how to play the piece, notes, rythym etc. before you can let your feelings come out (go in, whatever). Once you have the piece learned, you play it with less concentration on reading every single note, and more on the lines, phrases, or dynamics that allow your feelings to rise to the surface. You begin to feel the music the way the composer intended. And then every time you play it after that, more feelings come out of your performance. Does this make sense? I get what I'm saying but many times others don't.
Don't you wish you could pop into that painting? I'd like to go to the painting that is similar to that one, but it's Chopin playing the piano.