(CNN) The boulder is known simply as "The Rock" and it's a fixture on the campus of Michigan State University.

It's a constantly changing billboard . Students leave everything from birthday greetings to political messages, one layer of paint at a time.

Students painted the boulder white, along with the words "THANK YOU" in teal, and a heart.

They also hand-painted the names of more than 150 women who accused Nassar of abusing them.

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