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.
2017-04-12 01_49_49-10 Gartentricks die euch zu Pflanzenexperten machen - KlickDasVideo.de