Only here the 4D part is not in fourth spatial dimension but in future time: Room A404 is in, say, year 1960; Room B404 occupies the same 3D physical space but in year 1970! And "fields" maintaining them keep collapsing - so guests in Rooms A404 & B404 keep ending up in the same space & time...
Fact sheet.First published: If, May 1954.
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Related: Stories of Winston K Marks.