Date: 1947, 1958

"Religion, ethics, metaphysics – these are merely the 'spiritual' and 'inner' festivals of human anguish, ways of channelling the black waters of anxiety – and towards what abyss?"

— Lefebvre, Henri (1901-1991)

Date: 1979

" But they can be sent along the usual channels […] until at some critical point, a "mental faucet" is closed, preventing them from actually being carried out."

— Hofstadter, Douglas (b. 1945)

Date: 1999

"On its own this trigger, as we can see from the earlier definition, is not going to generate consciousness. Imagine a candyfloss machine with a stick in the centre that then gathers more and more candyfloss as time goes on. Think of the epicentre as the stick in the centre, the burgeoning candy...

— Greenfield, Susan (b. 1950)