Very true wizard, it's very hard in real life to find something that is perfectly straight, or perfectly aligned, it just doesn't happen, even most man made objects that we think are perfectly straight or aligned aren't always quite as perfect as we think. Suffering from OCPD i notice this a lot more than most people, there's not a moment goes by when i don't notice something that frustrates me because it's not perfectly aligned.
Walls, floors, and ceilings are usually our "reference" frame when we view a room, however, even these aren't perfectly straight or aligned, not by a long shot, they usually (unless brand new and precision built) have bends and not quite 90 degree angles, just look at any ceiling in your house closely, you will notice that it has a slight bow downwards, and the older the ceiling is the more pronounced that bow will be, this is because the plaster board is attached to wooden beams, and over time those wooden beams absorb moisture when it's humid, and dry out in the heat, rinse repeat, which causes them to warp, sag, and stretch over time.
I've just spent the last week redecorating my house, and you would not believe the frustration i've been feeling because of my OCPD, it's only when you get close up with a paint brush trying to cut those edges in perfectly that you notice how warped and twisted four walls and a ceiling can be
This is actually one of the reasons i'm taking such a long time to create The Island, my brain is wired different because of my OCPD and i have to force myself not to align everything on a grid to get it perfect, i've built my first level a dozen times, then just scrapped it and started over because everything looked too false and perfect.
Primary Desktop:
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
Secondary Desktop:
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
Laptop:
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.