The Thinkers in Eibon

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Fillers of the Ivory Cup
Hoojiro, a member of the Thinkers in Eibon
Other Names Thinkers in Eibon
Species Unknown (Most likely humans)
Location Outside World

The Fillers of the Ivory Cup (象牙の杯を酌む者, Zōge no Hai wo Kumumono), alternatively Thinkers in Eibon, is a mysterious organization that studies and experiments with the universe's unknown mechanisms, which they call "Black Boxes".

General Information[edit]


The Thinkers in Eibon named themselves after the Cup of Eibon, which is a mug-shaped cup that is "filled in the abyss accumulated at the base of a spring of wisdom, deep-rooted at the pith of the world", according to Hoojiro Shitodo. Interestingly, it is said that someone has seen the Cup of Eibon before.

Black Boxes[edit]

The Thinkers in Eibon believe that much of the world is still unknown and conduct experiments using those mechanisms, which they call Black Boxes. In science, a black box is a system whose internal workings are not understood, but can still achieve results based on inputs and outputs.[1]


While Tsubakura being part of the Thinkers in Eibon is unconfirmed, it's possible that they are, given their close ties to Hoojiro and their research into the workings of Mugenri.

Background Information[edit]

Name & Origin[edit]

The organization's name "Fillers of the Ivory Cup" uses the character 酌む for "fill", which could also mean "to serve (drink)" and "to drink". Which means that the "Ivory Cup" could be filled and drank by, as well as served to their own members. "Ivory Cup" is a reference to the "Magic: The Gathering" card of the same name.

Their alternate name "Thinker in Eibon", makes reference to the legendary Lovecraftian magician Eibon of Mhu-Thulan. The most famous artefact pertaining to him being the Book of Eibon, which contains the magic spells he practised, records of the area and historical accounts of other mages. However, there seems to be nothing that ties him to a cup.


A World That Isn't Fantasy[edit]

The Thinkers in Eibon was one of Hal and Hoojiro Shitodo's conversation topics in the short story of "A World That Isn't Fantasy".

Additional Information[edit]

  • It may be that Yabusame Houlen and Clause are members of the Fillers of the Ivory Cup as well, as sections of their themes can be found in "Ivory Cup ~ Cup of Eibon".