Mark Zuckerberg’s personal 2016 challenge to build an artificial intelligence system to run his home has been a learning experience for the co-founder and CEO of Facebook.

Some parts were simpler than expected and others were a surprising challenge, Zuckerberg said in a blog post.

“My goal was to learn about the state of artificial intelligence — where we’re further along than people realize and where we’re still a long ways off,” Zuckerberg wrote. “These challenges always lead me to learn more than I expected, and this one also gave me a better sense of all the internal technology Facebook engineers get to use, as well as a thorough overview of home automation.”

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