We're going to go on a little tourist attraction today: about 20 minutes from where I live in southeastern Arizona there is a large Spanish Mission from the 1600's, San Xavier Mission which, you guessed it, is chock full of ancient paintings done on the interior walls, throughout.
Its location is just south of Tucson on Interstate 19, off the road about a half-mile: you can easily see its inspiring spires from the Freeway.
From the outside San Xavier architecturally resembles any other gorgeous Spanish Mission (and very well kept up), all in white, with the arches and the domes, and the steeples, and the palm trees and cactuses, but it's the interior walls that present today's 2-dimensional subject.
All this artwork is like decoration, in the sense that all the painted lines run into each other, and all pictures, and designs, and borders are juxtaposed, one thing right next to another, from the interior top of the domes and steeples, down to the floor, and also on the walls from side to side. (It is a huge photo-op!) It actually reminds me of being inside a wedding cake, with all the cake decorations somehow projected onto the retinas of my eyes.....