Creative Origins
The gelatinous cube is an invention of Gary Gygax, and first appeared in the Monster Manual (1977), rather than being lifted from outside sources and adapted to a roleplaying setting, as were many mythological monsters like the minotaur and dryad.
Being a cube that is a perfect ten feet on each side, it is specifically and perfectly "adapted" to its native environment, the standard, 10-foot (3.0 m) by 10-foot (3.0 m) dungeon corridors which were ubiquitous in the earliest Dungeons & Dragons modules, particularly the randomly-generated ones created using the rules in the Dungeon Master's Guide.
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