At the northern end of the City Square facing Collins Street is 'the water wall'. I don't know if it has a proper name. It is irresistible to children who simply must touch the surface and the water. Many adults must have a feel of the water too. Teenagers arrange leaves, usually plane tree leaves in autumn, to form words on the wall. Strangely the leaves cling to the vertical surface. You can easily find videos of sticking leaves on YouTube.
The wall can look terrific in the right light. Here is a photo and a few seconds of video. I've just noticed there is name next to the water wall, John Mockridge Fountain. It was gift to the city from the late architect and bears his name. It was designed by Aspect Landscape Consultants and PL Fountains in 1998.