Füsun Onur (born 1938) is an artist whose practice is defined by the persistent use of modest materials. While her work recently met with a greater audience this summer at Documenta 13, in the local Istanbul context she has been showing with Maçka Sanat Galerisi since 1987. Her fifth solo show there remained on a characteristically modest scale. A slightly below ground level storefront, Maçka Sanat Galerisi is covered wall-to-wall in light brown-yellow tiles, from the steps leading to the entrance of the gallery into the gallery itself. Onur has employed the unusual space as both a catalyst and central element for “Variations,” with the muted lighting acting as a subtle deviation from the very particular architecture. The installation in the front room, at first glance, is almost invisible. From a distance, the tiled wall seems to be speckled with colorful dots, but upon closer inspection, the work is revealed as barely but fully three-dimensional. Each tile is covered in sheer plastic that is peeling off on one edge, weighted down by colorful paper clips. Here we find a subtle threat of being dismantled—the fragility of the materials in clear contrast to the flawless yet weathered unity of the tiles, suggesting …