Put on your thinking caps and, most of all, have fun! You can have as many guesses as you want ….
Spoiler alert: do not read any further unless you want to see the answer.
Solved after 90 minutes of really intense cross-examination and international co-operation by UK-based Red Bubbler Alixzandra who worked out that this is the side of the famous Spiegeltent or mirror tent that is such a huge part of the Australian festival scene each year. By the way, the word “spiegel” actually means mirrors.
I do not crop, enhance or post-edit my images in any way. Shot with a Pentax K100D, using a Sigma 18-125mm lens. F8, 1/180 sec, ISO 200, focal length 78mm.