Iranian artist Parviz Tanavoli has built a successful career around the concept of nothing. Tanavoli creates sculptures of the word “heech,” which means “nothing” in Persian. The abstract shapes he fashions using Iran’s centuries-old calligraphic nastaliq script have cemented his reputation as the father of modern Iranian art. Tanavoli’s first solo retrospective in the US opened this week at Wellesley College’s Davis Museum outside Boston and runs through June 7. The exhibit comprises 175 pieces – including sculptures, paintings, jewelry and ceramics – from his more than five decades as a contemporary artist.