architecture beam cog gear Gwynedd historical nostalgia old shaft spar spindle teeth tooth traditional turn wales watermill waterwheel welsh wheel angles appearance bamboo binding bound constructed construction craftsmanship decorative display distinctive energy exterior external flow flowing flowing-water garden garden-water-feature knots knotted machine miniature miniature-waterwheel ornamental ornamentation outdoors perspectives rope roped secure secured stream structure tied turning undershot water water-driven water-flow wet mill wooden chaos chrome drops explode fluid Fractal fractals round splash sundfractals