I just finished this self adjusting or tilting "Seiza" or meditation stool, it is rather quick to make it took me only 8 hours in total (drawing and templates excluded).
In this stool one sits kneeling on the floor and it keeps your butt from lying on your heels hampering your blood circulation or straining your knees. I was inspired by some simialr designs I found on the web although the dimensions and details are mine.
It is made out from two scraps of oak I had and one of them was spalted or so I think due to its dark color and the black spots and the way the wood looked when sawn, besides I know it had been laying on the floor of a barn for a few years.
First I drew the front and side views of the foot and cut it on the band saw after having made the tenon on my TS.
Here you can see the piece with the cut outs.
Then instead of sanding it I decided to remove the saw marks with a gouge to give it a more natural feeling, besides it is much faster and less messy than sanding. Gouging it leaves a shiny faceted surface that I find pretty attractive. May be it is my carver side.
Then I proceeded the same way with the seat, the wood was from a complete different scrap and origin and it shows.
Before going any further I made a dry fit to check the fitting and the height.
Here you can see the finish that is obtained with a shallow nº 2 gouge