Passage: In the mid-1970s, Bayramov embarked on what was to become his most celebrated series, Cultural Figures. This series contains portraits of individuals recognized by Bayramov as having made important contributions to Turkmen cultural heritage during the late twentieth and early twenty-first centuries. The creation of Cultural Figures would span more than four decades and result in more than 150 individual portraits.

Question: What did Bayramov embark on?
Cultural Figures