Hal supine, Pemulis wants to interface (p. 909)
Now I was making a cage of my hands and watching the light through its shape as I rotated it.
Context
Hal's idle hands while he brushes off Pemulis's last urgent request to talk. Carlisle catalogues the gesture with the timing as the point: Hal builds a cage of his hands in the same minute the queued-up cartridge contains Peterson's The Cage — the depression-cage shrunk to a private hand-shadow Hal peers through from the floor.