What are the rules and circumstances in #recursion for artifact movement?
Solution 1:
The rules change from week to week, and sometimes during play, it seems.
The rules for the Las Vegas event are at IQTech Research - Google+ - #DICE2014 #RECURSION
Rules for the final LA/Berlin event
Example of rule changes for L7+ portals needed for artifacts: Ingress post on G+: Breaking lab analysis
Some updates are at Ingress - Google+ - #RECURSION XM ARTIFACT STATUS