Water may not add much in the way of height (unless you install an impressively tall fountain), but its movement adds the dimension of sound. Aquatic centres stock a wide range of self-contained features that circulate water from a reservoir to a waterfall, waterspout or bubble jet, with smaller ones being suitable for patios and conservatories. And if you build a couple of raised pools, linked by water flowing from one to the other, you can introduce some height into this very pleasing focal point.