Asian Plate with Spiral Pattern

Hello everyone! I was at an auction this weekend and found this pottery plate among a stack of plates that I purchased. It measures 9 1/2" in diameter. I don't know where to begin in trying to figure out who, what, when, and where. I searched Gotheberg but couldn't find anything even close. I'm assuming that's a mark from somewhere in Asia but that's a guess. Is it a modern studio piece? Should I try and clean it and with what? Thanks for whatever help you can provide.
Don

 

Was it the Twilight Zone or Outer Limits that had that swirling pattern at the beginning of the show? This reminds me of that.

 

Do not adjust your screen.......

 

OMG. Had to scroll past that FAST!

 

Not fast enough.......

you are now under my hypnotic control !

Now listen very closely.......................

 

I don't know anything about the maker's mark, but I'm pretty sure the decoration technique is called hakeme. White slip was applied with a brush while the potter was spinning the bowl on the wheel.
Google images: hakeme pottery

 

Good link. I'd never heard of it. The mark looks more Korean than Japanese. It seems to be a stylized image

 

Sorry, folks, I was going to respond sooner but after komokwa's first post I blacked out. Came to this morning in the backyard wearing a tin foil hat and not much else. I'm hoping I didn't do anything too embarrassing but will keep a low profile around the neighborhood for the next few days just in case.
Thanks, Lauragarnet and Bev for your insights. I've got a new area to explore! Don

 

Sorry about that Don !!

( but my minions out of Chicago video taped the entire evening......and golly gee, I was not aware that you could do those kind of things with a live raccoon !!! )

ps...( the raccoon is now in Therapy !! )

 

You sure it was a raccoon & not a tanuki?

 

Now that I think would have remembered!
Don

 

& thus....the video !!!