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It appears that the space can be formed of any two congruent rectangular cuboids, not only cubes; perhaps even parallelepipeds? —Tamfang (talk) 00:04, 16 May 2024 (UTC)[reply]

Any objection to rewriting the Construction to match the image, i.e., change "top cube" and "bottom cube" to left and right? —Tamfang (talk) 22:43, 5 February 2025 (UTC)[reply]