A 937 eruption at Mount Fuji left a cave shaped like a womb
A 937 eruption at Mount Fuji left a cave shaped like a womb Popkin 9:00 am Thu Aug 6, 2026 lava tree mold — Photo by funk bass / CC BY 3.0 (via Wikimedia Commons) In the year 937, Mount Fuji erupted and sent the Ken-Marubi lava flow down its northern slopes and over a stand of fallen trees. The lava hardened around the trunks while the wood inside burned away, leaving long hollow tubes in the ground. One of them is the Funatsu-Tainai lava tree mold, a narrow cave near Lake Kawaguchi that Atlas Obscura describes as revered in Japan as the womb of Mount Fuji.
- ▪A 937 eruption at Mount Fuji left a cave shaped like a womb Popkin 9:00 am Thu Aug 6, 2026 lava tree mold — Photo by funk bass / CC BY 3.0 (via Wikimedia Commons) In the year 937, Mount Fuji erupted and sent the Ken-Marubi lava flow down it
- ▪The lava hardened around the trunks while the wood inside burned away, leaving long hollow tubes in the ground.
- ▪One of them is the Funatsu-Tainai lava tree mold, a narrow cave near Lake Kawaguchi that Atlas Obscura describes as revered in Japan as the womb of Mount Fuji.
Boing Boing files mainly under tech. We currently carry 460 of its stories.
Story provenance
Source · retrieval · rights · ranking — open for full record
inspect →
Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | Boing Boing |
| Canonical URL | https://boingboing.net/2026/08/06/funatsu-tainai-lava-tree-mold.html |
| Publication time | Thu, 06 Aug 2026 16:00:00 +0000 |
| Retrieval time | 2026-08-06T16:50:47.821Z |
| Last seen | 2026-08-06T16:50:47.821Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | ZGAh24Xfs78W · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
A 937 eruption at Mount Fuji left a cave shaped like a womb Popkin 9:00 am Thu Aug 6, 2026 lava tree mold — Photo by funk bass / CC BY 3.0 (via Wikimedia Commons) In the year 937, Mount Fuji erupted and sent the Ken-Marubi lava flow down its northern slopes and over a stand of fallen trees. The lava hardened around the trunks while the wood inside burned away, leaving long hollow tubes in the ground. One of them is the Funatsu-Tainai lava tree mold, a narrow cave near Lake Kawaguchi that Atlas Obscura describes as revered in Japan as the womb of Mount Fuji. The comparison comes from the walls. The burning trees left the inside of the tube ribbed and rippling, which struck visitors as the inside of a body.
…
Excerpt limited to ~120 words for fair-use compliance. The full article is at Boing Boing.
Discussion
0 commentsMore from Boing Boing
