text: One of these artworks, which consists of a woman holding a baby in her arms, was executed in Siena by Jacopo della Quercia, and was named for Gaia.
full_question: One of these artworks, which consists of a woman holding a baby in her arms, was executed in Siena by Jacopo della Quercia, and was named for Gaia. Another of these works, showing a man kneeling on a shell and drinking from another shell, was commissioned by the Barberini. One of these works was built around an obelisk crowned by a dove holding a tree branch in a piazza next to the Palazzo Pamphili. Nicola Salvi is today remembered for designing one of these works. For 10 points, name these works such as the Four Rivers and the Trevi, which include flowing water.
first_sentence: One of these artworks, which consists of a woman holding a baby in her arms, was executed in Siena by Jacopo della Quercia, and was named for Gaia.