I apologize for the not-great pic, but note the red barn at the top, with the words “vintage market.” Above it is a piece of art depicting geometric patterns. I’ve seen these on a lot of barns/farmhouses around here – indeed, there’s about a 15-25 mile stretch of road (around Caledonia, Missouri, USA if it matters) where just about every agricultural building has one, different on each building of course.
Originally hex signs to protect the farm and also used to guide passengers along the Underground Railroad, barn quilts have become popular. Some areas have established driving tours that take you along the scenic byways dotted with ag buildings decorated with barn quilts.
Can’t get the OP’s image to load, so was literally going by the thumbnail, my apologies. Barn quilt is right. Looks like a relatively recent phenomenon, as folk art goes.
Maybe some folks have adopted them as that, but no, the origin really was just to look pretty. I suppose that you could use one to identify a specific known barn, as for instance one owned by an Underground Railroad conductor, but that was never their purpose, either (and they weren’t as common in pre-Civil War times, anyway).
From that same Wiki:
" The Amish do not use hex signs."
&
" Anabaptist sects (like the Amish and Mennonites) in the region have a negative view of hex signs, and they are rarely, if ever, seen on an Amish or Mennonite household or farm"
My reading of the whole article is that they originate with the non-Anabaptist German immigrants (the so-called Fancy Dutch). This tracks with how the Amish generally shun decoration anyway, like the buttons thing.