Toyo Ito, a Japanese architect who broke from Modernism and designed a library that survived his country’s catastrophic 2011 earthquake, was awarded his profession’s top honor, the Pritzker Architecture Prize, on Sunday.

“Toyo Ito is a creator of timeless buildings, who at the same time boldly charts new paths,” the Pritzker jury said in its citation. “His architecture projects an air of optimism, lightness and joy and is infused with both a sense of uniqueness and universality.”

In a telephone interview Mr. Ito, 71, said he was gratified by the honor, especially because it represents an acceptance of his position as an iconoclast who has challenged the past 100 years of Modernism.

“I’ve been thinking that Modernism has already reached to the limit or a dead end,” Mr. Ito said through an interpreter. “I didn’t expect this surprising news, and I’m very happy about it.”