On the POSTING FLOOR, there are three items, which can each be combined with one of three liquids. Combining the KEY MOLD with the MOLTEN METAL creates the KEY necessary to advance to the second floor, but if you combine the POST TEMPLATE with EAU D'EGGBUG, you generate the post above.
It's not used for anything, but we went through a couple iterations, gradually making it more and more ridiculous until we settled on this.