This is not the largest in the world but it is enormous, and is also amazing for having been built by a 15-year old to answer the question: "When I was 14 I asked my piano teacher how long a bass a string would need to be if it had no copper on it at all".

I love this follow-up quote: "I think because I was so young I absolutely knew it was totally possible to do, I was fully determined and without consulting any professionals I had no barrier stopping me."

https://www.alexanderpiano.nz/page/the-alexander-piano

There's also something quintessentially New Zealand about the whole story - making it in a mate's garage, and then moving the project to a farm tractor shed when it got too big and the inaugural concert that looks like it's still in the same shed, the photo of the tractor moving it for the outdoor concert...