anchor.diff:    artworkId: String!
     category: String
     clientMutationId: String
  +  costCurrencyCode: String
  +  costMinor: Int
     date: String
     depth: String
     height: String
  
positive.code:   artistIds: [String]!
    category: String
    clientMutationId: String
    date: String
    depth: String
    height: String
  
negative.code:   # Returns the associated Fair/Sale/Show
    context: ArtworkContext
    contextGrids: [ArtworkContextGrid]
  
    # The currency code used to pay for the artwork
    costCurrencyCode: String
  
    # The amount paid for the artwork, in cents
    costMinor: Int
    culturalMaker: String
    date: String
  
  