It is 16 degrees off the vertical, and the chair bottom slopes up 6 degrees from the horizontal. Thus the slot in the leg has to be ten degrees from a perpendicular line off of the front end of the leg. The chair bottom is shaped, by me at least, by spoon planes of varying sizes. There are schemes for building jigs to rout out most of it, but I think they're more trouble than they're worth unless you plan on making a lot of them.
I have been looking at Daiku Dojo's pictures of the
mocked up rendition of a Nakashima Conoid chair. Can you please tell me
the angle of the side leg in relation to the chair foot. It appears to
be about 60 degrees, but I would appreciate learning the actual
Also, can you tell me how the seat was carved out?
from my iPad=