Is there an external material world ? There is an external world, but it is immaterial, meaning that phenomena such as weight, color, reflex, etc(all material, henceforth 'illusions'), are physical sensations. The quddity of stars colliding is supreme logic, that to minds is a statistical event of which can be exemplified, giving what is an image, sensation.
Does a star weigh X, or, does a star project weight X as sensation?
The vex. An illusion of different centres.