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A view of the corridor of the interior of the cylindrical tower. On the right side of the image is the cylindrical exterior wall and on the left side of the image the massive solid interior column is visible.
There actually is an outer “cylinder” (right side of image) that is constructed around a round central column (left side of image) and stairs are wedged in between the two parts. The student in the image is about 5 ft. 9 in. [1.7 m.] tall.