There was a device which, by oscillating a mirror forward and back and projecting a succession of images in the right order, created the facsimile of a three dimensional object.
Here, the words shift and oscillate between pun, metaphor, 'found phrase' and allegory, and refer forward and backward in the text until the actual surface of the language appears to be swimming and shifting. The emotional freight emerges apparently unbidden out of the ether.
This work suggests a quite colossal command of the English language and requires some work by the reader to gain a purchase.