“This is the speaker cone. It’s when Strange comes into some kind of a black hallway and he is becoming layers of himself. That starts in space and then he’s being sucked into a hole. We call that the speaker cone because it’s something that vibrates in space.We were looking for a material that’s very close to graphite, and it’s vibrating all the time and it’s surrounded with some kind of rocky belt.” – Method Studios vfx supervisor Olivier Dumont.