Photo taken by Luiz Gomez. For chinadaily.com.cn

I will continue my search for the origin of the smiles — smiles as pure as crystal water; touching smiles, when you can clearly see into a person's eyes; the kind of smiles that brighten the rest of your day. The kind of smiles that, while lasting only a moment, you remember for the rest of your life.

After five years, I think I'm starting to figure out where these smiles are coming from. I'll keep traveling to see more smiles and possibly a few more wonderful roofs. Shanxi province is a good place to find both.