You might as well ask what sex is. It's something you need to experience to understand. Go to a gathering. Basically it's a bunch of hippies (and not just hippies anymore. Lots of punks, christians, hare krishnas, computer programmers, etc. everything) camping together. It's like a festival, without admission fee, without vendors, without paid employees, without anyone being in charge. All entertainment and education is spontanious, informal, and free. It's something different for everyone.
I'd just like to clarify that it isn't sex, and that it's a whole lot easier to explain sex than de rainbow. Heck, ya can even draw pictures to explain sex...and there's a billion web sites w/ live feed of it, lol.
there's a lot of web sites for explain rainbow too: http://www.welcomehome.org/rainbow.html http://groups.msn.com/OntarioRainbowFamily http://www.rickross.com/groups/rainbow.html and images: http://frenchrainbow2.free.fr/chaudaucoeur/chaudaucoeur.html http://keywestgallery.com/Pages/Performers/InSpiritpages/bophotos.html and music!: http://frenchrainbow2.free.fr/familybook/chantsetsons/rainbowspirit/chantsrainbspirit.html http://frenchrainbow2.free.fr/familybook/chantsetsons/chantsetsonsitalie2002/chantsetsonsitalie2002.html# and more, and more... but no one can make it feel yourself like in a true rainbow gathering, exactely like sex experience, because it's first a relation, not just a serie of sensitive stimulations! om, peace