An Odd Eureka! How to Greet Everyone in Partner- Shifting Dances, such as Dances of Universal Peace
Some embodied spiritual practices include partner dances, consisting of two circles of participants, where the people of the inner circle face those of the outer circle, and one circle 'moves over one person' for each round of a chant or ritual gesture. One property of such dances is that each person ritually encounters the people from the other circle, but none from that person's own circle. With a 'line dance', as described below, each person may encounter everyone else in the group, not just half of the group.
In the line dance I have in mind, there are two lines of dancers, facing each other. The following diagrams show how five people in such a line dance can progress through five rounds of a chant or ritual gesture. Of course, the lines of people could be wavy, but for the sake of easy illustration they are here depicted as straight. Person '1' in the diagrams below is highlighted, in order to help more clearly to illustrate how the dancers shift positions for each round of the dance.
The progression through a dance would work similarly with any odd-numbered set of dancers. Also, one can deduce that, with any odd number of dancers, e.g., five, it takes exactly that number of (e.g., five) rounds of the dance for each person to encounter each other. Note, however, that each person also has one round of non-encounter. The diagrams below show how Person 1 encounters, in order, Persons 5, 3, (no-one), 4, and 2. Similarly, the other four dancers also encounter each of their compatriots over the course of this dance.
The above sort of line dance maximizes the number of encounters, but it turns out that this full set of encounters occurs only with an odd number of dancers. With an even number, each person encounters only half of the group, making such an arrangement no more 'friendly' than dances that use the familiar pair of circles. E.g., in the following progression around the line, with six dancers, each person encounters only three others, and sees each of them twice during the one progression. Specifically, in this example, Person '1' encounters Persons 6, 4 and 2, but no others.
How then to handle the case where there is an even number of dancers? If one is leading such a dance and wants to maximize the number of (distinct) encounters, then one can ensure that an odd number of people are participating in the dance by either joining the group or remaining out of the group, depending on which choice makes the total number of dancers an odd number. Alternatively, with an even number of dancers, two of the dancers could cluster together, acting as one as they progress around the line. These two could then have one special round at the very end (or beginning) to encounter each other.
Thus, whether we have an even or an odd number of dancers, there are ways to make use of a line dance so that we maximize the encounters between dancers. If we want our ritual dances to let each person encounter each other person, then I recommend the use of the 'odd line dance' formation indicated above!