The E-Machine: Only One Entrance/Exit between the five rooms, until the deepest room, and one Entrance/Exit to the Outside World at the Shallowest Room.

 Twitter shallow?

Twitter doesn't like me using Italians [definitely not Blacks or Armenians] as scapegoats. Asians are ? Dec 7

See Deep Work circa 2018 by Cal Newport. See also, Digital Minimalism (2019) by the same author.