the contact-barrier and the dream thoughts and un-conscious waking thinking which are the texture of the contact-barrier are turned into alpha-elements, divested of all characteristics that separate them from beta-elements and are then projected thus forming the beta-screen.
Bion demonstrates that the reversal of alpha-function strips alpha-elements of their differentiating properties, reducing them to beta-elements and thereby generating the beta-screen through projective evacuation.
, Learning from Experience, 1962thesis