This website uses Sitelen Pona, a hieroglyphic script for the constructed language toki pona . The vocabulary of toki pona is very small. That's why words have to span across broad semantic fields. By adding words together, you can further narrow down these concepts. To say something in toki pona, you have to pay close attention to the meaning of what you want to express. I use toki pona to write poems and songs, to journal and to compose little stories. I also found some other speakers who I occasionally talk to in the language. It's a lot of fun for me!
You can get more information on Toki Pona on the website of the language's creator or here on Wikipedia or you can check out the language's own wiki.