When Dick Nelson is accidentally exposed to a tremendous electromagnetic field, he comes out with his body reversed left-to-right, essentially a death sentence since certain necessary stereoisomers will be unavailable in the reverse form in his diet. The solution is to flip Dick over once again, requiring a trip through the fourth dimension (spatial) and a bit of time travel to boot. The head physicist assures Nelson that this is purely a spatial fourth dimension that he’ll be flipped over in.
“You say that Nelson has been rotated in the Fourth Dimension; but I thought Einstein had shown that the Fourth Dimension was time.”

Hughes groaned inwardly.

“I was referring to an additional dimension of space,” he explained patiently.

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  1. “Technical Error” by Arthur C. Clarke, in Fantasy, December 1946.
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Arthur C. Clarke