From the introduction:
From the rain-slaked canopy at the top of the City, to the luminous labyrinth of canals far below, the flow of water and the light of the sun provides the City’s inhabitants with infinite, renewable energy.
Genetically modified algae feeds the oceanic farming platforms, vast perpetual engines cycle away waste to be rapidly repurposed, each piece of the complex ecosystem being a part of the grand puzzle that sustains Earth, the City and its denizens.
In this golden age any former definitions of social inequality have crumbled. Through genetic modification and the integration of nanotechnology into every aspect of existence the human experience can be tailored down to the finest detail. Your gender, your appearance, both have become but trivial modifications, bereft of any historic stigma.