I have seen lots of water walls around like this ONE from Play Based Learning or this ONE from Teach Preschool, (both amazing and inspiring websites). I have been wanting to try it but wasn't sure how to execute it on our wooden fence. While cleaning out the shed, I found a box of storage containers and decided it was the perfect time to try it. I used little nails and hammered the plastic containers to our fence. Then I filled our table with water, although you can use whatever you have, of course. I had made these giant ice balls (just fill a balloon with water and add a few drops of color), and was planning on using them in the sand box, but put them in the water instead. It was huge hit with my son and a great way to cool off on a hot day!