Osman Hamdi Bey's "The Tortoise Trainer"

Nationality: Turkish
Born-Died: 1632-1675
Creation Date: 1906Size: 87.2 × 47.2 inch (221.5 x 120 cm)
Media: Oil on canvas
Location: The Pera Museum, Istanbul, Turkey

This wonderful painting seems to have some kind of message and I wish I knew what it was.