Director David Lowery has made one of the most remarkable films of 2017 so far, and he’s built it around a ridiculous image: a white sheet with two eye-holes cut out. So what makes “A Ghost Story” feel so epic? And what’s with that 10-minute pie scene? Spoilers abound.     For the Spiel: so, who was in the room with Don Jr. and the Russians?  Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at slate.com/gistplus.