On the left, we see a depiction of the showbread or bread of the presence. I write about this feature of the tabernacle in “Bread of the Presence.” Pages 4:446-447 in The Encyclopedia of the Bible and Its Reception (EBR). Edited by Hans-Josef Klauck. Berlin: Walter de Gruyter Publishing House, 2012.
Click for link (though it's probably best to see if your library has it).