One of the most iconic sights of the past few weeks in Iran has been the Freedom Monument - the focal point of many of the protests against the Iranian government.
The giant archway with the fanned-out base has dominated the Tehran skyline since it was built in 1971.
Originally commissioned by the Shah of Iran in the 1960s, it was the vision of Hossein Amanat, then a 23 year old graduate.
The BBC's Rebecca Kesby asked him where he got the inspiration for this symbol of modern Iran.
First broadcast 4 July 2009