© Penguin/Tampa Bay Times/TNS "Dr. Seuss's Horse Museum" by Dr. Seuss, illustrated by Andrew Joyner.

You know Dr. Seuss books helped make your kids smart.

And now there's a new one that's all about art!

Wait, a new Dr. Seuss book? The beloved children's author and illustrator, whose real name was Theodor Geisel, died in 1991. But Random House Children's Books has announced that it will publish a new book by him on Sept. 3.

According to an email: "The original manuscript for 'Dr. Seuss's Horse Museum' was discovered in the late author's La Jolla, Calif., home 21 years after his death, alongside the manuscript for the 2015 No. 1 New York Times best-seller "What Pet Should I Get?"

Seuss left notes and sketches for "Horse Museum," but not a finished book. His publishers worked with Australian illustrator Andrew Joyner, whose books include The Hair Book and the Duck and Hippo series, to re-create Seuss' unique visual style.

"Dr. Seuss's Horse Museum" also reflects Seuss' intense interest in modern art, and the book will incorporate full-color images of horse-themed works by such artists as Pablo Picasso, Rosa Bonheur, Alexander Calder, Jacob Lawrence and Jackson Pollock.

Dr. Seuss has been the target of some recent criticism, with studies showing that some of the images of people of color in his books use racist stereotypes. In 2017, the National Education Association rebranded its 20-year-old literacy program Read Across America, centered on his books and his March 2 birthday, to de-emphasize his work.

But he remains a beloved author, and many communities and schools in Read Across America continue to include his books.

"Dr. Seuss's Horse Museum" will have a first printing of 250,000 copies.

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