Futura has an appearance of efficiency and forwardness. Although Renner was not associated with the Bauhaus, he shared many of its idioms and believed that a modern typeface should express modern models, rather than be a revival of a previous design. Renner's design rejected the approach of previous sans-serif designs (now often called grotesques), which were based on the models of signpainting, condensed lettering and nineteenth-century serif typefaces, in favour of simple geometric forms: near-perfect circles, triangles and squares. It is based on strokes of near-even weight, which are low in contrast. The lowercase has tall ascenders, which rise above the cap line, and uses a single-story 'a' and 'g,' previously more common in handwriting than in printed text. The uppercase characters present proportions similar to those of classical Roman capitals