When I really really want to concentrate, I wear this hat. It really helps.

"The Isolator is a bizarre helmet invented in 1925 that was used to help increase 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."