Actually it IS rocket science and a definite art, as is the fine art of plastering! There is a significant difference between Rembrant and a squaddie on jankers slapping whitewash on a rock!
Was Rembrandt a decorator? Just wondering, because the local guy who did our decorating was excellent but I doubt his ability to recreate The Night Watch or Belshazzars's Feast.
Started out with nothing. Still have most of it left.