Wat Phra Thong is perhaps not the most impressive of Phuket's temples, but it surely has the best story behind it. And once you know the story, the 'half image' that forms the center of the temple will have way greater resonance.
According to lore, a boy was out watering a buffalo and tied it to some metal protruding out of the ground. In quick order, both boy and buffalo died, but the boy appeared to his father in a dream and told him to investigate the object.
When the father dug around the place, he found the tip of a golden Buddha sitting buried in the ground. All attempts to excavate it over the ensuing centuries failed, and there are stories of attacks by hornets when locals tried to dig it out in the 18th century!
Eventually it was decided to leave the exposed top of the Eventually it was decided to leave the exposed top of the Buddha statue where it was - it so obviously resisted being dug up! - and build a protective layer and a temple over it. That is what you can see today.