expansion outwards in all directions. the big bang. the crucifix pose. drawings of stars (and their associations; cosmic, star of david, etc), drawings of the sun with the circle in the middle and all the rays spreading out, leonardo divinci's man with all his limbs in different directions (arm leg leg arm head), lifting hands in rapture.
.One of the key binaries Barty is using is the zoom in/pan out binary and at the endpoint of each trajectory, the obliteration of self, the white light, the limit. Consciousness narrowed to extreme reductive focus on one thing or expanded to encompass Everything. This is not something which needs explaining as we are all very familiar with this process. We switch between these modes and points in between perpetually.