I've been doing some research trying to find the answer to this question and haven't come up with any specific answer, so if this is often asked, apologies. If anyone has a good source on clans most of this could be ignored.
From what I understand, Ork Clans are more just philosophies or movements that orks can adhere to. Goffs are big and krump things, Bad Moons are rich and shoot things, Deathskulls take stuff, etc. How do the clans originate though? For example, if an ork is spored in a Goff heavy zone, does he automatically dawn the black regalia and develop a love for punching things? Or, if he were to decide he really liked riding bikes, could he go off and join an Evil Sunz force, assuming there wasn't one nearby (I'm not sure how exclusive clan dominance is either). Is clan-ness hardwired into the ork, akin to engineering in Meks and what could more or less be called surgery in Doks? Territorial dominance is another question, I assume its done more by Tribe/Warband (whatever you want to call the orks in a given area under the control of a Warboss) and not by clan, but I'm not sure how clans fit into the Warband. It is unlikely, at least to my knowledge, that any Warband would be clan specific (WAAAGHs definitely not being exclusionary), but is it just the case that the Warboss' clan is in charge in regards to general tactics or does everyone just kinda do their own thing as long as they're fighting something?
The reason I ask is that I almost always see people making mono-clan armies. I'm not against it or anything, it gives them a nice flavor and good visual coherency, but I was just wondering about the feasibility of a multi-clan army. I'm working on a Kult of Speed at the moment which seems to be an overarching movement above clan affiliation, so that an ork could be 'in' both without any problems, and the Kult seems to span clan lines. It'll probably be heavily Evil Sunz, what with them being the most likely candidates, but I thought to break it up a little bit that it would be interesting to put a few other Clan mobs in there, Goffs as a large BW mob, Bad Moons as shootas and the like. Would that be fluff-friendly as a small ork force of multiple clans all making up a kult, or are orks solely clan divided on a small scale (both in a Kult of Speed, and in general, as they might be different). Also, any ideas on how to give it more cohesiveness as an army would be appreciated, assuming its kosher. I'm hoping that general painting style and similar detail colors will tie them together, as orks are pretty ramshackle as is, along with a generous addition of red for obvious reasons.
TLDR/Orky version: Orks and Clans, 'ow dey wurk?