One aspect of the Christmas Tree Sails propulsion involves forwardly incident gluon beams for which the gluons upon closing in on the spacecraft produce a sudden pulling effect on the spacecraft much as an electron will be suddenly pulled into a highly positively charged ionic atoms upon close approach to the atom. An obvious caveat is the production and stabilization of gluon beams in transport over large macroscopic distances. Another fascinating effect would be derived from Mach's Principle and as such would enable a motive force acting on the spacecraft as a result of the entire thermodynamically and casually spacecraft-wise coupled portion of the physical universe, or of the greater physical cosmos. An analogue to the above physical Mach's Principle motive effect would include motive force acting on the spacecraft or light sail as a result of craft's thermodynamic and causal coupling to the spiritual components of the coupled portion of the spiritual universe or greater spiritual cosmos. I welcome you to read this series of books to find out more.