We’ve discussed before the challenges when manufacturing those rectangular doors with matching frames when they have tapered radiused corners.
But noticed on that door- step 1 is radiused, so is step 2, then step 3, the innermost one, has square corners, with frame square to match, and then the boltcase housing the boltwork is strangely radiused, so it’s all radiused curves with a set of square edges part of the way in…weird.
Love the bi-metal effect on the gears with the steel and bronze. Amazing how it looks quite a bland door at a glance but has some nice details up close.