Kodama

Shout in the mountains and something shouts back.

Japanese folklore does not call that an echo. It calls it a kodama — the spirit in the tree, answering you.

That's the whole concept, and the two halves of it are the same word: the spirit that lives in an old tree, and the voice that comes back off the mountain. Somebody is in there, and they replied.

The oldest thing here

The kodama is about as deep as this tradition goes.

There's a tree deity in the *Kojiki of 712 that reads as its prototype. It's in The Tale of Genji, grouped with foxes and demons among the uncanny agencies of the world — which tells you that by the Heian period this was understood as a spirit*, not merely a piece of botany.

And it's still visible. Go to any shrine forest in Japan and look for a tree with a thick straw rope around it — a shimenawa — often with folded white paper strips hanging from it.

That rope means this tree is not lumber. Someone is home.

Which trees, and what happens if you cut one

You cannot tell by looking. A kodama tree looks like any other tree, which is the entire problem — and the reason the ropes exist, because otherwise there's no way to know.

The spirit isn't rooted, either. It moves — it "nimbly bustles about the mountains," which distinguishes it from the tree itself. The tree is an address, not a body.

Cut one down and you bring curse and misfortune on yourself.

And the old trees bleed at the axe.

That last detail is the one that stays with people, and it's worth pausing on because it isn't merely gruesome. Anyone who has ever felled a tree knows that some of them weep — sap running from the cut, dark and slow. The folklore is looking at something real and telling you what it means.

Sekien opened with it

Here's a small choice by a man who made a lot of them, and I think it was deliberate.

Toriyama Sekien's Gazu Hyakki Yagyō — the first volume of the catalogs that built the entire modern yokai canon — opens with the kodama.

Plate one. Before the demons, before the shapeshifters, before the whole night parade: an old man and an old woman standing before a tree.

The first creature in the first catalog is the gentlest one there is. That's an opening note, and it sets the register for everything after it: this is not a book about things that want to hurt you.

The echo split off

One more piece of taxonomy worth knowing.

The echo eventually got its own creature. The yamabiko — a small beast — appears in the picture scrolls and in Sekien as a separate being whose whole job is answering you from the far side of the valley.

So the kodama-as-echo and the yamabiko are siblings: one concept that divided, leaving a tree spirit on one side and a shouting animal on the other.

Which is a fair description of how a great deal of this material behaves. A single experience — a voice coming back off a mountainside — with two names, two pictures, and eventually two entries.

And the practice never stopped

On Aogashima, in the Izu islands, great cryptomeria are enshrined as "kodama-sama" and actively worshipped.

In Okinawa — a separate tradition, and it should be named as one — there's the kiinushii, the tree-master, who is prayed to before felling. Not propitiated afterwards. Asked, first.

That's the practice underneath all of it, and it's the one that survives: before you take the tree, you address whoever is living in it.