This is the organ of Glasgow University Chapel - the same chapel I explored the roof of a couple of months ago. Luckily the chaplain is a good bloke (and I fix his bike on occasion) so he invited me inside to photograph the absolutely incredible organ.
Originally built along with the rest of the chapel in 1929 for the sum of Â£75,000 (an incredible Â£3.7M in today's money), it was in a bad way until it was recently restored for a similarly eye-watering amount.
It really is an incredible work of engineering, though - there are 2,500 pipes in all sizes, from ones smaller than a pencil to ones taller than three people, made of metal or wood.
How's this for a fantastic valve system? The air reservoir empties, the weight drops, it pulls the fabric tape over a couple of pulleys, and opes the valve to let in more air.
It was a really cramped space to work in - the organ was also being played at the time, so quite loud and I kept being squirted with jets of air!
That's it, really...