Those that want the sound to change as they move their heads should investigate the Smyth Realizer system. This is mature technology that has been available since 2009. It is very impressive to listen to when sitting.
Another approach to headphone listening is to buy Darin Fong's software for your computer. This changes the sound (via computer) thru the headphones to emulate how multiple high end speaker systems sound. It will simulate Wilson speakers and Axe Recording Studio speakers just to name a few choices.
Both of these systems have a major effect on the headphone listening experience. Both are worth investigating.
David Pritchard