The Crooked Room
Excerpt from Melissa Harris-Perry, Sister Citizen p.29:
Field dependence studies show how individuals locate the upright in a space. In one study, subjects were placed in a crooked chair in a crooked room and then asked to align themselves vertically. Some perceived themselves as straight only in relation to their surroundings. To the researchers’ surprise, some people could be tilted by as much as 35 degrees and report that they were perfectly straight, simply because they were aligned with the images that were equally tilted. But not everyone did this: some managed to get themselves more or less upright regardless of how crooked the surrounding images were.
see also Happy Doll