French to English Art/Literary Art, Arts & Crafts, Painting museum display

This comes from the description of a museum exhibition. The term cimaise appears a few times, but I'm a little stuck on its use in this particular sentence:

"La galerie au décor minéral était toute indiquée pour abriter la promenade qui se déploie
entre les hautes **cimaises** de verdures."

It's just a sentence in a long list of short descriptions, so the rest of the surrounding text is unrelated, but refers to the strolls people would take through the gardens.

Here's another example where the word "tapissées" suggests it refers more to the walls themselves: "Pour la chasse, l’espace est celui d’une clairière, lieu de rendez-vous et de départ d’un laisser-courre et les **cimaises tapissées** d’un fond naturel donnent l’illusion de la vitesse et des cavalcades dans les sous-bois."

I've come across various definitions of cimaises, the most common being picture rails, picture hanging systems, gallery rods, moulding, exhibition panels, and even the more figurative "gallery walls" (which is what I used for the second example).

But I'm a bit thrown off by this notion of "hautes cimaises de verdure". I'm trying to imagine what this looks like, perhaps greenery hung from picture rails high up on the gallery walls? It might be easier to figure out if I had a picture, but since I can't go to the exhibit myself, was hoping some art/museum specialists might have some idea...

Thanks in advance!