Let’s be clear: PAU’s two proposed skyscrapers will still have plenty of glass. But the firm has dialed back the slickness substantially with the use of fins, frames, color, and a bit of playfulness. The tower likely to get the most attention is the 512-foot extrovert at the intersection of 30th and JFK Boulevard. Segmented into three hip-swiveling segments, the office building will be accented in bright red terracotta and metal. Perhaps even more improbable than the color is the treatment at sidewalk level. PAU has given both this tower, and its more sedate, 360-foot companion, a delicately arched arcade that recalls the mod architecture of the early ’60s. Think I.M. Pei, Minoru Yamasaki, Wallace K. Harrison, and Edward Durell Stone.