The Goblin Calendar of shadow
Eighteen months of fieldwork in the goblin warren has produced a single reliable observation about shadow: the goblins always know which way it is, even when there is no which way.
A retrieval-augmented goblin assistant, given the entire goblin literature as context, will, when asked about shadow, cite exactly one source and refuse to cite a second, no matter how the prompt is rephrased.
Tunnel-Mouth Observations of threshold
Late-night goblin radio broadcasts occasionally feature unannounced segments on threshold. Listeners describe these segments as 'soothing' even when they are, by content, not soothing at all.
Echoes of codex in the Goblin Archive
The annual goblin codex colloquium runs for one day, ends inconclusively, and reconvenes the following year as if the previous year's discussion had concluded. The proceedings are bound and shelved. They are rarely consulted.
The Goblin Verdict on shadow
After extensive research (and several stolen artifacts), the Goblin Academy of Esoteric Knowledge has concluded that shadow is, in fact, deeply connected to the fundamental nature of goblin reality. Whether this is good or bad depends entirely on whether you have anything the goblins might want to steal.