The place where CHICKENS ROOST: the manner in which chickens copulate is normally with the rooster (male bird that roosts atop female bird) hopping on top of the hen's hind end in an unstable stance as the hen often runs around a bit during copulation, and the cock may literally fall off her ass. Furthermore, the cock's hens often have two bald spots on each side of the tail where the cock's feet and constant mounting to copulate have caused all the feathers to be pulled from the skin. Chickens copulate in the cloaca, a multi-purpose orifice that serves as the receptacle for receiving incoming semen from the rooster, the exit for laying eggs, and the sole excretory port for both feces and urine.
　Nonetheless, a BOX is an old vulgar English euphemism for「vagina」and it should be no surprise that it is, considering where and when it originated 　[　https://www.urbandictionary.com/define.php?term=box　]　
　Undeniably, part of the stimulating appeal of using no-longer-integrated feet as male masturbatory pleasure tools in dynastic China was to provide a simultaneous view of the young female's breasts, genitalia, and anus, perhaps with the object of getting it all over with as soon as possible to allow the next guy in line to come into his own too, hence the meanings THINKING WHILE OUTSIDE OF THE BOX, THINKING OF WHAT IS INSIDE THE BOX, and ultimately THINKING ABOUT BEING INSIDE THE BOX, a roosting cock in the box, and so on…and while a service provider's pretty face may have also been visible, it would have been difficult for her to suppress the signs of utter boredom, so it may not have been an important focal point of most clients who much preferred gawking at THE BOX and fantasizing.
　Measuring depth and capacity, and in the case of these elements, that of a「woody with two no-longer-integrated feet, or, the meat slit」measuring each foot in contrary positions in particular when the「woody is deviated, in a contrary position」due to a past or present infection. Bamboo baskets resembling cages (CELLS, GRIDS) were attached to infected groins and used to hold poultices and provide protection from painful physical contact of sensitive infected areas.
　A CELL or GRID resembles wooden branches used as rails elevated off the ground for hens to roost upon when sleeping:「By instinct, chickens want to roost ('go to bed') in the highest point available, and be gathered together in a group for protection and warmth while they sleep. Your chickens will be happier animals if you play to their instincts when you are designing their living space. If you were to place multiple roosts inside your coop with some higher than others, they may fight to get the highest ('best') spots: to avoid this, you keep the roost at all the same level. …A chicken roost is a very simple board…or a wooden clothes rod like you would put in a closet, or even a thick tree branch that is about [2-3 inches in diameter].」
　　[　https://www.pet-chicken.com/why-chickens-need-a-roost/ 2014-09-29　]　
　CELL also refers to CONFINEMENT and RESTRICTED MOVEMENT, LOSS OF LIBERTY as when jailed.
　Elements and meanings are associated both with chickens and with the lifestyles and relationships of「birds, chicks」as euphemisms for people with no-longer-integrated feet used as sex objects cooped into a harem copulating with only one rooster (「one that roosts」upon the hens).「Feet meat, emissions in rotation, woody」described the conditions in a chicken COOP with lamed chicks or birds cooped up for a rooster to mount easily, and that same imagery fits the CRUEL treatment of young girls becoming sex meat for sale or as rentals. ROOST means to「sleep or rest temporarily」which is not the nest. MEASURED BOX initially in China referred to places where hen chickens build a nest and lay, which is not the roost, and both were often made of wood. But in Japan, now refers to a handheld square wooden container used to measure volume of dry rice grains, or, with which to drink sake.
　A rooster naturally gets around to each hen in the animal harem and services her via copulation on a regular「rotation of emissions」for optimal results and peace within the coop, and the same applies with a gaggle of jealous and very young human females competing constantly for the attention of a single male. The ROOSTS also must be constructed all at the same height, if possible, within a single coop to avoid fighting among the females for the highest roosting perch. MEASURED BOXES for nesting also must be the same relative size for these same reasons (and is why they are called 'measured' so as to assure they are all about the same size and shape).

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Japanese: measuring container, measure, box, square on a grid, cell of a grid
Unihan extended: variant of 枡 a measuring box
EDRDG: measuring box; (kokuji)