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You notice this when you start to learn drawing (at least I did) - it's not that you don't know how to draw, say a horse, it's that you have no idea what a horse really looks like. Ordinarily you just jump to a whole lot of conclusions.
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The classic example is that nobody can remember the basic shape of a bicycle: https://www.booooooom.com/2016/05/09/bicycles-built-based-on...
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I feel this in my soul. I thought I could replace a door in a day, but months of fiddling, I discovered by frame is not only a parallelogram but it literally shifts by over an inch between seasons. (~100yr old house 2nd floor)
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That’s why most doors come prehung in a jamb. Just add shims and then cover them with trim.
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I lived in a flat in a 200-ish-year-old building when I was at uni. Lovely flat, handy for uni, handy for work, near the shops, near a park, flatmates were pretty okay, comfortable, airy, well-lit, and warm.

Here's the thing we - a flat full of nerdy tech students - never figured out.

The walls in two of the bedrooms (including mine) were perfectly plumb, all four walls straight. Bookshelves lined up nicely with the walls. The floor was flat and level.

But the room was 10cm narrower at the ceiling.

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Have you ever been to The Mystery Spot[1]? It is a fun tourist trap with all sorts of conundrums like that.

[1]: https://www.mysteryspot.com/

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obviously a small space-time anomaly. Nothing to be alarmed about. Sapphire and Steel have been assigned.
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This is the answer we came up with. Guy in the flat downstairs must have been dicking about with supermassive dark matter.
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I wonder if this could all be solved if doors are triangles instead of quadrilaterals.
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Or round, like the hobbits do
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You lough, but the cork always plugs the bottle eventually. Cone shaped round doors with cork on the rim.
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Leather with a drawstring, like a purse. Never needs oil, and my granny knots will keep the lock-picking lawyer out longer than your yale.
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deleted
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You guys have doors?
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Check if it's the hinges that are yielding.
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they can lean at all sort of weird angles too, experienced finish carpenter are worth their weight in gold
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