"Yubyeolnam" Photo Exhibition [Yu; That Is So]

Fired at high temperature, clay changes permanently and hardens. Earthenware can be fired in an open fire at around 600°C and is normally fired below 1,200°C; unglazed, it lets water through. Stoneware is fired at about 1,100–1,300°C and is dense and watertight. Porcelain, usually made with kaolin, is fired at 1,200–1,400°C and is hard and slightly translucent. Glaze is a glassy coating on the surface that makes a piece watertight and also decorates it. The earliest way of shaping was by hand: pinching, joining slabs, or building up coils of clay ring by ring; throwing on the potter's wheel came later. On the Korean peninsula, Goryeo celadon developed the sanggam inlay technique in the early 12th century, and in the Joseon period buncheong ware and white porcelain led.

Look closely at the surface: is the glaze glossy or matte? Where it is thin, does the colour of the clay show through?

• Ceramics: clay and kiln 陶瓷：泥與窯火→Same topic in Taipei

A photograph taken on film is first developed into a negative, which is then exposed onto photographic paper in a darkroom, usually enlarged, to make a positive print; a digital camera turns the light into a file instead. The exposure time decides how time appears in a photograph: a fast shutter freezes motion, while in a long exposure still buildings stay sharp, car lights draw streaks, and passers-by who are there only briefly disappear. Long exposures are easiest in low light. Rut Blees Luxemburg, born in Germany and based in London, photographs the city at night with long exposures, using only the light from street lamps and office blocks. Prints made by inkjet with pigment inks, often labelled pigment print or giclée, resist fading better than those made with dye inks.

Find the things in the picture that move: water, clouds, car lights, people. Are they sharp, blurred, or gone?

• Fashion photography 패션 사진→Fashion photography, made for magazines and brands, is one branch of photography.
• Photography 攝影→Same topic in Taipei
• Photography 写真→Same topic in Tokyo