There are two worlds:
Both seem so real that those who live in either one think those who live in the other are delusional!
Inside / outside!
Which one is more real?
Is your feeling more real than your physical body?
Is harmony less real than the bodies that seamlessly interrelate?
One of the most fascinating things I read was the Rebbe’s letter to the Israeli who became the head of the World-Teacher’s-Association.
In it the Rebbe writes, that schools provide two things, namely social skills, for in the playground people learn the necessity of give and take as well as skills, but what it doesn’t teach the person is the intrapersonal world.
Judaism and especially Jewish mysticism focus almost exclusively on the real intrapersonal (the inner world of your mind and emotions, for it is from that world that your behavior and you feelings hence you reactions, come from.)