With this ingenious filter you can create a photomontage the creative mask system is used in exactly the same way as the double mask system s 342 and 345 except that the mask and countermask are no longer central holes but other shapes custom made by the photographer himherself this is accomplished by tracing patterns on pieces of colored plastic enclosed with kit and cutting them out with a graphics knife not included by adhering the different cut out patterns to a cokin basic filt