Blue water?

Can someone explain why the water in the Art Gallery pond was dyed? It did look a bit odd - aqua water in a usually brown pond If it was to make it look blue - it only worked for a few days! (OK I know I can't talk - our pond is a bit of a nightmare too!)

Actually I just realised why it is now back to normal... RAIN! Don't tell me it rains in Perth.

Enough random ranting from me for now... Love Lissa