I think we would call this an "open wood-slat ceiling". It hangs beneath a gypsum drywall ceiling above, and is comprised of smooth clear Cedar 2x6 threaded by stainless steel rods about 36" on center (which are suspended by cables from above). This special detail above the seating niche is an extension of the overall wood ceiling in the adjacent living-dining-kitchen spaces. The adjacent ceiling areas are same material (clear Cedar), but shiplap instead of open wood-slat. Thanks for your question!