TAKE six artists. Which the Heineken Gallery at the Fringe Club has done. Then let them sketch in their own medium. And we have 4 Sides and 4 Spheres which is on show until Wednesday at Lower Albert Road. Of the six contributors, ceramicist Chris Lo supplies sketches in clay, while computer animation designer David Cheung ponders the intrinsic value of photography and the morals involved in manipulating photographs. And Ling Yue-bun, guided by green thinking, finds the collage in his sketches echoing recycling. Photography concentrates the mind of Warren Leung, painting occupies Sin Yeung, and the sketches of installation artist Sara Wong are records of her eccentric daydreams. HANART TZ Gallery boasts that its Summer Show, which begins on Thursday, on the 5th Floor of the Old Bank of China Building, will celebrate the end of a rainy Hong Kong summer. This may be a little precipitate. Nevertheless the gallery is providing a collection of bright and cheerful paintings to throw off the gloom. There are also new paintings in the pop style by Li Shan and You Youhan and new figurative works by Liu Wei and Zhao Xiaogang. Chu Hung-wah and Gaylord Chan are also featured, along with recent works by Yang Yiping and Mao Lizi. JIANG Zemin has one. So does former Soviet leader Mikhail Gorbachev. Even former US presidents Ronald Reagan, Jimmy Carter and Gerald Ford have them. They are ''alto-relief'' sculptures, an art form which disappeared during the American Great Depression and has been revived by Bill Mack of Minneapolis. At 17 Mack was a draughtsman making bronze dedication tablets when he saw a poor quality relief portrait for a memorial tablet which made him think he could do better. He soon quit his job and became a commissioned relief sculptor. To investigate further, visit Vincent Lee Fine Arts at the Ritz-Carlton Hotel, Central, where a collection of the sculptures are on show until September 15. WU Jiafu combines traditional Chinese with Western painting techniques to produce richly-textured works either on Buddhist matters or still-life. Hues of Summer, which features recent works by the native of Taishan, Guangdong province, runs until Saturday at the Wan Fung Gallery, Rooms 1621-22, Star House, Salisbury Road, Tsim Sha Tsui. THE Inspiration Gallery presents prints depicting village life in China and Tibet by Hubei-born Zhang Min Jie at the Arts Centre until Thursday. Art Zone is featuring a collection of 30 drawings, watercolours, Chinese and acrylic paintings in its first exhibition, also at the Arts Centre until Thursday. The centre has two ceramics shows coming up: with Tao Se Jiu Fen by the Purple Workshop from tomorrow and Clay in Clay 94 by the Ceramic Workshop from Friday. THERE is a wide variety of styles from the 13 painters featured in the Hong Kong Artists' Association's Exhibition of Oil Paintings at the Hong Kong Institute for Promotion of Chinese Culture, Room 1001, Shun Tak Centre, Central, from August 20 until September 3. THE Hong Kong Arts Club holds its 46th Annual Exhibition at the Exhibition Gallery, City Hall from September 2-4.