Tubalan Mortise da Tenon Concave-Convex tubalan itace ne na gina ga yara ƙanana. Wannan tarin ya ƙunshi guda 211 da aka fitar daga tsohuwar tsarin gine-ginen katako na kasar Sin mai suna mortise da tenon, wanda aka sauƙaƙe zuwa nau'ikan haɗi 30 kamar su murabba'in dovetail da T-shaped tenon. Ana yin tenons daga baƙar itacen walnut mai duhu, yayin da mortises kuma ake yin su daga farin itacen beech mai haske, don haka za a iya bambanta sassan biyu ta launi. Ana sassaka tubalan ta amfani da injin sassaƙa itace, sannan a gama su da hannu. Matakan wahala guda uku sun dace da yara daga wata 18 zuwa sama da shekaru shida, tun daga daidaita haɗe-haɗe guda ɗaya har zuwa gina manyan al'amuran wasa.
Sunan aikin : Concave-Convex, Sunan masu zanen kaya : Sha Yang, Sunan abokin ciniki : Shanghai Art and Design Academy.
Wannan babbar ƙirar nasara ce ta lambar yabo ta tagulla a cikin gine-gine, ginin da ginin tsarin ƙira. Tabbas ya kamata ka ga jigon zane na ƙirar mai ƙirar tagulla don gano sauran sabbin abubuwa, sababbi, na asali da na kirkirar gine-gine, ginin ginin da kuma ayyukan tsari.
