'Set in the thirtieth century, Egan's novel has sentient software on centre stage, with humans as bit players. Egan has always placed ideas above characterisation, and readers of this novel almost need a degree in physics
and information technology to follow it. Nonetheless, perseverance will be rewarded, as Egan explores spatial dimensions while trying to define what is humanity, especially when
humanity is not involved' (Colin Steele,
SF Commentary No 77, p.54).