dougong
...that the pieces of dougong, an ancient Chinese structural element of interlocking wooden brackets, are cut to fit so perfectly that no glue or fasteners are needed?
...that the pieces of <b id="mwEGQ"><a href="./Dougong" id="mwEGU" rel="mw:WikiLink" title="Dougong">dougong</a></b>, an ancient <a href="./China" id="mwEGY" rel="mw:WikiLink" title="China">Chinese</a> structural element of interlocking wooden <a href="./Bracket_(architecture)" id="mwEGc" rel="mw:WikiLink" title="Bracket (architecture)">brackets</a>, are cut to fit so perfectly that no glue or fasteners are needed?