New idea! Sure I've seen these recesses, but I thought they were for religious purposes, with a few candles, prayers, images, statues...
Maybe, I'll study this.
I'm now working on the living room floor plan, drawing different arrangements wood floor-tatamis, circulation, raised "table" with tatamis top. 10 different drawings done, at least 20 to do, until one fits better.
Just came back at dusk, will see the building progress tomorrow, will post pictures.