If you are wondering who Oma is, that is an informal way of saying Grandmother in German, like Nana or Grandma.
Check out Val’s Blocks in the Block of the Month Gallery.
The piecing gives a dimensional look to the background, in effect a “Trompe-l’oeil”, which is French for an optical illusion. Those usually have shadows behind the objects on the shelves, but that would get a little complicated. Maybe that is something that could be added to the quilting.