each of rectangular form with raised offset concentric rings or 'ripples' all in a deep blue on black glaze; excellent vintage condition with no chips or cracks; STEULER was founded in Höhr-Grenzhausen, a center of the ceramic industry in the Rhineland's Kannenbäckerland, in 1917.  STEULER reached its artistic zenith in the 1960s and '70s and is best known today for the inspiring designs of Cari Zalloni. Here's a fine specimen from Cari Zalloni's shapely and colorful 'Zyklon' line of 1968 for STEULER KERAMIK. 'Zyklon' vases are typically rectangular in form (although other shapes do exist) with raised offset concentric rings or 'ripples' that exceed the flat planes of the vase. They are always covered in smooth, glossy glazes, in a range of bright solid or tone-on-tone colors including metallics.