From the series "Ambiguous Space" of my abstract project "Pure Photography". Photography is "drawing with light". Pure photography means that the light itself, its color and/or its brightness creates an abstract image on a light-sensitive medium (film or camera chip) without beeing affected by a classical "subject" or, as the Bauhaus Master L. Moholy-Nagy wrote in 1927, the light-sensitive plate fixes the light modelled by mirrors, lenses or transparent crystals etc. - In this project a microscope is used as an optical bench. An optically active sample (pinhole, slit, grating, opaque stop, spherical lens etc.) is used to modulate the light beam falling on the camera chip. - In the series "Ambiguous Space" light creates two dimensional images with a geometric distribution of tones. Our brain, desparately searching for associations from the real world, interprets differences in brightness as spatial information. Our cognitive apparatus can be cheated so easily.