Imagine you’re Dorothy.  You have just escaped Auntie Em and a life of rusticated farm-life.  You step out of your house, and no more black-and-white, but BOOM!  It’s a colour explosion, where you are literally on the other side of the rainbow.  And never mind those Munchkins… What would you think, honestly?  That you are in some strange kind of fever-dream?  Or that you have accidentally ingested a potent hallucinogenic (let’s forget for the moment that Dorothy probably doesn’t know what that is)?  Or, simply, that you’ve just gone crazy? I think it fair enough to say that these feelings may be eerily similar to those experienced by Matisse and…