Here is an idea for a vertical garden in a classroom (plus a fish tank). This could also work in other places -- homes, places of worship, community centres, etc. Maybe even outdoors? With a mesh covering over the fish tank, the cats couldn't get in.
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Pink Echeveria Afterglow dots the carpet of gray-blue Dymondia margaretae, repeating the hues of the larger sculptural accent plants: bronze-tinged Sundowner phormium is striking beside an icy blue Agave attenuata Nova.