On 19 August 1839, the patent for the 'daguerreotype' - the first photographic process - was released to the world. And we have the French government of the time to thank. Merci. Photography has come a long way and we take for granted the… technological leaps and bounds that have happened over the past century and three quarters. This collection highlights the work of four artists who push photography even further, by way of subject or technique.