LONDON.- Emerging from the radical transformations of the British art scene over the last two decades is a pool of artists working in the field of abstract painting. As a loose group of well-established innovators these artists have turned the concepts of abstraction upside down, opening up complex new meanings by questioning what constitutes a painting and how it is made. The values of abstraction in Britain today are a far cry from the rigours of Minimalism and Abstract Expressionism, thanks to one of the most diversified and dynamic generations ever. As one of its most distinctive exponents, Michael Stubbs has taken a fresh look at what constitutes abstraction by producing his own idiosyncratic language, mixing and grinding decorators materials and graphic symbols in the process. His work can be placed