. The concept that two or more objects may exist in the same space and at the same time is a mainstay of science-fiction today; however, it may have been first promoted in the fantastic novel from early in the 20th century.. What was "the Blind Spot?" A room in a house at 288 Chatterton Place in San Francisco - certainly. A doorway into another cosmos, a different world? - probably. A gate into the past or the future? - perhaps! One thing is certain: it is GREAT STUFF!. Originally serialized in ARGOSY in 1921, reprinted in one or two pulps in the 40s, but not put into book form until this Ace edition in 1966. It includes a long introduction by Forrest J. Ackerman.