Michigan State already has one commitment from Bel Aire (Kansas) Sunrise Christian Academy and is looking to add another.
"It was great," he said. "I already liked the players and the coaching staff. They were very humble and very cool.
"They were just being themselves. They didn't roll out a red carpet and I just got to see it how it is every day."
That humility and attitude had Clark feeling comfortable from the moment he arrived.
"They all really liked me and everybody was talking to Coach (Tom) Izzo about me and the players texted Coach Izzo about me," he said. "I feel like we already had the connection.
Clark already has a connection with Nairn, who committed to Michigan State in September.
"That's my brother," he said. "We look out for each other and I'm pretty sure that speaks for itself."
He said it would be hard to turn down continuing to play with Nairn, also his AAU teammate, but was pleased that Izzo didn't use that as a recruiting pitch.
"The thing that I respected about Coach Izzo is that he didn't use that in his pitch it all," he said. "He told me he could use that, but he didn't. He told me that even if I didn't choose Michigan State that he would still root for me so I respect him a lot as a person.
"That's the realest thing I've ever heard from a high-major coach."
The Spartans extended a scholarship offer to Clark last Thursday, and he quickly set up the visit.
"Initially, I wanted to save my last visit for them, but Indiana wasn't really feeling that," he said.
So Clark flipped his plans to visit East Lansing instead of Bloomington last weekend and will visit Indiana on Wednesday.
A decision will come a week later, he said.
"I'm going to sit down Saturday with my mentor and my coaches and then cut my list down and that next Wednesday, I will make my decision," he said.