The mark of a great photographer is the ability to take the commonplace and compel the viewer to look at it anew. If Raghu Rai does this with a facility that now seems paradoxically clichéd, it is because his ironic juxtapositions and unusual framings have become the commonsense of &lsquoart&rsquo photography, the first trick that every aspiring lens-person relies upon. Yet, among the legions of followers who have been inspired by his style, few can match him. Why this is so becomes clear when one leafs through Trees, a collection of monochrome pictures by Rai.