Well I got a reply from the City of Perth yesterday afternoon re the poster:

Dear (Noodlez)

Thank you for your email regarding the poster/banner on the hoarding in

front of the GPO in Forrest Place.

The particular theme of the banner was chosen as it was considered that it

would be bright, colourful and attractive to children as well as displaying

a multicultural aspect.  This banner is a temporary measure while the GPO

is being refurbished.

We appreciate your comments and these will be taken on board if the City

undertakes any similar projects next year.

Regards,

I have to admit I wasn't expecting a response that quick.

So I guess that's it till I find something else to rant about.