from wiki:
Personal Space: The term proxemics was introduced by anthropologist Edward T. Hall in 1959 to describe set measurable distances between people as they interact. The effects of proxemics, according to Hall, can be summarized by the following loose rule:
“ Like gravity, the influence of two bodies on each other is inversely proportional not only to the square of their distance but possibly even the cube of the distance between them."
Body spacing and posture, according to Hall, are unintentional reactions to sensory fluctuations or shifts, such as subtle changes in the sound and pitch of a person's voice. Social distance between people is reliably correlated with physical distance, as are intimate and personal distance, according to the following delineations:
Intimate distance for embracing, touching or whispering
Close phase - less than 6 inches (15 cm)
Far phase - 6 to 18 inches (15 - 45 cm)
Personal distance for interactions among good friends
Close phase - 1.5 to 2.5 feet (45 - 75 cm)
Far phase - 2.5 to 4 feet (75 - 120 cm)
Social distance for interactions among acquaintances
Close phase - 5 to 7 feet (1.5 - 2.1 m)
Far phase - 7 to 12 feet (2.1 - 3.6 m)
Public distance used for public speaking
Close phase - 12 to 25 feet (3.6 - 7.5 m)
Far phase - 25 feet (7.5 m) or more
Hall notes that different cultures maintain different standards of personal space. In Latin cultures, for instance, those relative distances are smaller, and people tend to be more comfortable standing close to each other; in Nordic cultures the opposite is true. Realizing and recognizing these cultural differences improves cross-cultural understanding, and helps eliminate discomfort people may feel if the interpersonal distance is too large ("stand-offish") or too small (intrusive). Comfortable personal distances also depend on the culture, social situation, gender, and individual preference.
The felicific calculus is an algorithm formulated by utilitarian philosopher Jeremy Bentham for calculating the degree or amount of pleasure that a specific action is likely to cause. Bentham, an ethical hedonist, believed the moral rightness or wrongness of an action to be a function of the amount of pleasure or pain that it produced. Thus, the felicific calculus could, in principle at least, determine the moral status of any considered act. The algorithm is also known as the Utility calculus, the Hedonistic calculus and the Hedonic calculus.
Variables, or vectors of the pleasures and pains included in this calculation—which Bentham called "elements" or "dimensions"—were:[clarify]
Intensity: How strong is the pleasure?
Duration: How long will the pleasure last?
Certainty or Uncertainty: How likely or unlikely is it that the pleasure will occur?
Propinquity or Remoteness: How soon will the pleasure occur?
Fecundity: The probability that the action will be followed by sensations of the same kind.
Purity: The probability it will not be followed by sensations of the opposite kind.
To these six, which consider the pleasures and pains within the life of a person, Bentham added a seventh element:
7. Extent: How many people will be affected?