Locked sliding dovetail timber framing

[Ole Anderson]

If this amazing Japanesevideo has been posted before please excuse me:

https://www.facebook.com/video.php?v=1551371291768726&set=vb.1444293462476510&type=3&video_source=pages_video_set

If I am not allowed to paste a Facebook link, please remove it.

[Andrew Hughes]

Cool video I have seen it one before, looks like the wood was cedar very crisp joinery for the light airiness of the wood.Thanks for posting.Aj

[Marc Seguin]

That is very impressive. Thanks for sharing it.

[Keith Pleas]

Very impressive. What's the purpose of those small slots in the tops of both pieces?

[Ole Anderson]

Very impressive. What's the purpose of those small slots in the tops of both pieces?
I believe those are from a marker, I don't believe they are slots.