Rueda LLANTA is a structure that sub-divides an even-number of couples into two separate sub-groups in concentric circles.
Alberto Valdez introduced the LLANTA structure at the 2011 Cubanero Festival in Novi Sad, SERBIA:
In this video for the International Flashmob Day, 3 Rueda groups in Boston combined and called a 10-couple Rueda LLanta: