How does John Le Carre use imagery in The Honourable Schoolboy?

Imagery:

"Afterwards, in the dusty little corners where London's secret servants drink together, there was argument about where the Dolphin case history should really begin. One crowd, led by a blimpish fellow in charge of microphone transcription, went so far as the claim the fitting date was some sixty years ago, when 'that archcad Bill Haydon' was born into the world under a treacherous star. Haydon's very name struck a chill into them. It does so even today."

"There is a kind of fatigue, sometimes, which only fieldmen know: a temptation to gentleness that can be the kiss of death. Jerry lingered a moment longer, staring at the orchids and the stone boy, and setting them in his mind beside everything he had seen and learned of Ko till now. And he had an overwhelming feeling—only for a moment, but dangerous at any time—of completeness, as if he had met a family, only to discover it was his own."