LONDON.- The Alan Cristea Gallery, Cork Street W1, will today unveil an exhibition of David Hockney’s largest and most colourful lithographs in an exhibition entitled ‘Moving Focus. A focal point of this free exhibition will be two views of the ‘Hotel Acatlán’ which the artist discovered when car trouble forced him to stop in the midst of a journey to Mexico City. Taking place from19 January until 18 February 2012 in the gallery’s space at No. 34 Cork Street, the exhibition is timed to coincide with the Royal Academy’s major new show of landscape works by Hockney, and is one of a number of art exhibitions and auctions celebrating the work of one of Britain’s best loved artists to take place this month. In the mid-1970s, shortly after moving to California, David Hockney began his working relationship with master printer Kenneth Tyler. It was with Tyler, that Hockney created the Moving Foc