Shortz FIBONACCI SERIES (33A. Mathematical sequence related to a pattern found in a 17-, 29-, 42- or 58-Across, informally), ARTICHOKE (17A Food with a heart), NAUTILUS (29A. Cephalopod known for its shell), INNER EAR (42A. Cochlea locale) and SUNFLOWER (58A. Van Gogh subject ) constitute the interrelated group of this brilliant