Ethan Hawke was aware of co-star Robin Williams’ mental health struggles on the set of 1989’s Dead Poets Society, saying he was cognizant of “the complexity of his emotional life.”

In an interview with CBS Sunday Morning, Hawke recalled an incident when he first noticed Williams’ vulnerability.

“I remember, once, he was making up lines, and everybody’s laughing and everybody’s praising him, and I went to get a glass of water, get a bagel or something, and I saw him hiding in a little corner, just hiding in the dark, by himself,” said Hawke. “And I [go], ‘Oh, OK.’ It makes a lot more sense to me now, actually. It was a lot; it was taxing. There’s a lot of stories about clowns and the happiness that they give and at what cost.”

The four-time Oscar-nominated actor, 55, starred with Willia

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