"Coloured Sketch", a group exhibition features 12 artists including among others Ehab Lotfi, Samir Fouad, Wagih Yassa, Mustafa Rahma, Galal Al-Husseini, Mohamed Tarrawi andHanaa Hashem is currently on show at Duroub gallery in Garden City. All sketches on display are 50x60cm and this art genre is very rare and its exhibition are very seldom although it is very ancient and goes back to the Pharaonic era and inscribed on the walls of temples. Every painting began as a sketch, however, by time, painters started to add colours reminiscent of the paintings of Picasso and Rembrandt. A sketch (ultimately from Greek – schedios, "done extempore") is a rapidly executed freehand drawing that is not usually intended as a finished work. A sketch may serve a number of purposes: it might record something that the artist sees, it might record or develop an idea for later use or it might be used as a quick way of graphically demonstrating an image. Sketches can be made in any drawing medium. The term is most often applied to graphic work executed in a dry media such as silverpoint, graphite, pencil, charcoal or pastel. But it may also apply to drawings executed in pen and ink, ballpoint pen, water colour and oil paint. The latter two are generally referred to as "water colour sketches" and "oil sketches." The art of drawing sketches is at the core of every effective figurative image, whether it's a loose three-minute drawing or an obsessively observed and reworked three-year painting.Learning how to sketch is a fundamental skill for all artists. When working on a new piece, the artist's initial sketch drawing establishes the overall proportion of his object, fixing the mood, the pose, and the underlying rhythms of his composition. The painting in the picture is by Tarrawi. The show is running through 2 October.