Ayuda Fotografía digital realizada por Pablo Alberto Salguero Quiles a la entrada del Museo Geominero de Madrid (España) el viernes, 27 de febrero de 2004. La fotografía está realizada con un tiempo de exposición un poco largo con el fin de no utilizar flash, que no está permitido en el museo, asi como trípode, por eso está un poco movida, o cuanto menos, no tan definida como deseaba. Se retocó con programas informáticos de edición de imágenes el color y la luz con el fin de que se ganase en definición de imagen.

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