In BOL,, Maria Blondeel presents a comprehensive collection of blueprints and remnants of audio-visual work from the period 1987?1990. Her installation Bal, Dozen en vazen (Ball, boxes and vases) of 1987, which comprised, amongst others, a projection of slides and a sound performance, started with a piece of advice by Paul Cézanne (1839?1906):?Traitez la nature par le cylindre, la sphère, le cône, le tout mis en perspective (?)?. Besides this, in a series of contact sheets one can observe how, back in the eighties, blueprints were projected on top of each other, after which they were photographed again. Recently, a selection of those analogue photographs was printed on Japanese paper. Blondeel literally connected the visual and auditory, by transposing images of the slide series into sound? called?sonification?. In addition, she published the booklet Verheven Werk (libretto, opera elevato) in 1990, a libretto for four voices, which was recited simultaneously with the homonymous stereoscopic slide projection.0.