In the oasis complex, the thirsty man images he sees water, palm trees, and shade not because he has evidence for the belief, but because he has a need for it. Desperate needs bring about a hallucination of their solution: thirst hallucinates water, the need for love hallucinates a prince or princess. The oasis complex is never a complete delusion: the man in the desert does see something on the horizon. It is just that the palms have withered, the well is dry, and the place is infected with locusts.

It was a bestseller in the US and UK. What's in a Marriage?: Argues that expecting one person to be a good partner lover and parent is almost asking the impossible. —The Independent

Negative reviews allege that de Botton tends to state the obvious from a position of privilege and have characterized some of his books as pompous and lacking focus.

In August 2008 he was a founding member of a new educational establishment in central London called The School of Life. In October that year de Botton was appointed an Honorary Fellow of the Royal Institute of British Architects in recognition of his services to architecture. His books and television programmes discuss various contemporary subjects and themes emphasizing philosophy's relevance to everyday life.