Like many other "pulp sci-fi" stories of the early 20th century, this one utilizes the concept of the "fourth dimension". Unlike some of the others which toss around those terms casually, Olsen's stories offer a particularly informative...and particularly mathematical discussion of the ideas behind it.

In particular, this story includes an emphasis on the concept of "projection" and a table working out some numerical values associated to the geometry of a tesseract.

This story was published in the February 1928 issue of Amazing Stories. I only learned about this work of mathematical fiction (and several other similar ones by the same author) from the website mathfiction.net where a digital scan is available for download.