You don't step over it, it is the side wall of the house. It's quite a wide and long hallway and there is an opening above that goes up alongside my upstairs bedroom patio to the sky, it's only covered by mosquito screening. So, when it rains, it rains on the pond and when the sun is directly overhead in the summer it gets sun.
I thought of putting lights for some water plants but there isn't a good place to mount them that isn't unsightly, I worry about adding electrical to the wall or in the pond and electricity is very expensive here so it would cost a lot to run. I've replaced the plants in the center box with what we call teléfono - Pothos. It is doing much better than anything else and it is helping with the splash as well. Not my favorite but it is working. Whatever is in there has to live bare root in rocks in the water, those boxes are the filters for the fish and pond below. I have various cichlids and some mollies in that pond.
I have a couple orchids on the ledge of the columns above, they are doing all right there now, not sure if they will be as happy there in the winter. One day I'd like to mount a very long piece of driftwood I have up there and cover it with orchids and bromeliads - maybe when I get better at raising orchids.