Проблемы с концентрацией?
А у кого их нет!
Такое полезное изобретение.
The Isolator is a bizarre helmet invented in 1925 that encourages focus and concentration by rendering the wearer deaf, piping them full of oxygen, and limiting their vision to a tiny horizontal slit. The Isolator was invented by Hugo Gernsback, editor of Science and Invention magazine, member of “The American Physical Society,” and one of the pioneers of science fiction.
via A Great Disorder
“Science and Invention” magazine covers can be seen here: http://www.magazineart.org/main.php/v/technical/scienceinvention/