certain factors in nature are ordered without its being possible to find a cause for such an order… In the realm of the mind or psyche acausal orderedness is manifest in such examples as the fact that 6 is a perfect number
Von Franz defines acausal orderedness as causeless natural order manifesting in both physical constants and mathematical necessities, and distinguishes it as the general principle of which synchronistic events are only momentary special instances.
, Psyche and Matter, 2014thesis