Take the following as truth: The Princes' Chapel (Cappella dei Principi) is a piece of 17th-century Baroque bombast in flamboyant multi-colored marbles, for which the altar was not completed, appropriately enough, until 1939.
Then the following statement: "The Cappella dei Principi's altar took around 300 years to finish." is true, false, or inconclusive?
Answer: True