Here's a foto of the world's oddest tuba...a complete DOUBLE TUBA (2 sets of ports/tubing like a double horn) in BBflat and EEE.
The designer/owner (pictured) is both a physicist and a tubist.
It weighs about 50 lbs but plays in tune. He has it configured so the root-mean-square intonation error is near zero.
No photoshop was involved in this. I do NOT apologize for the size of the pic...it was needed to show the size of the instrument.