House of Leaves. It's a book that's been around for a bit, but I believe that it got popular with the zoomers because it was an inspiration for myhouse.wad
It's an abnormaly written allegory for loneliness. Theres a lot going on in the book, but the terror starts when a journalist discovers that his new house is a fraction of an inch bigger on the inside than the outside. After that door leading to a pitch black room just shows up in their house.
It's a reference to a horror book that starts with a protagonist discovering his house is slightly bigger on the inside. Spooky hijinks ensue, and somewhere along the way you loose your mind reading that book.
I don't know anything about the book in question, but I assumed it was because of the way the hook at the end of tape measures has a little play to it. If it's a poorly made tape measure that doesn't account for this properly, you get slightly different measurements by hooking around something versus pushing it against a surface.
Oh right, fractions of an inch are usually expressed in fractions of powers of two. SI humour went right over my head because I'm used to seeing weird fractions involved in those measurements.
I thought it was powers of two because it's not hard to find the halfway point between two other points, so you find the 1/2 mark, then the 1/4 mark, then 1/8, 16, 32, depending on how much precision you need. Then, at some point the unit changes again to mils or something like that.
After doing some digging in to this, I was thinking of the thou or mil, which is a thousandth of an inch. There's also another one that I hadn't heard of: the line, which is apparently equal to... 1/12 of an inch. Lol full circle.