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You might find Ken Kitano's work of interest: http://www.japanexposures.com/2010/02/05/ken-kitano-gallery/ Alan On 22 Feb 2010, at 11:28, Lucas Figueiredo wrote: That's a clever way of "counting people/cars": http://digitalurban.blogspot.com/2010/02/tutorial-photoshop-image-stacking-for.html It can't get numbers, but it is clearly useful for identifying paths in open areas / parks, etc. Regards, -- Lucas Figueiredo Universidade Federal do Rio Grande do Norte Professor Visitante do Departamento de Arquitetura MUsA - Laboratório de Morfologia e Usos da Arquitetura LATTICE - Laboratório de Tecnologias de Investigação da Cidade