People visit a 3D painting exhibition in Warsaw, Poland on Sept. 12, 2020. The exhibition displays over 60 replica paintings, which have been modified and can be viewed in 3D. (Photos: Jaap Arriens/Xinhua)

A woman visits a 3D painting exhibition in Warsaw, Poland on Sept. 12, 2020. The exhibition displays over 60 replica paintings, which have been modified and can be viewed in 3D.

A couple view a replica painting at a 3D painting exhibition in Warsaw, Poland on Sept. 12, 2020. The exhibition displays over 60 replica paintings, which have been modified and can be viewed in 3D.

A woman views a replica painting at the a 3D painting exhibition in Warsaw, Poland on Sept. 12, 2020. The exhibition displays over 60 replica paintings, which have been modified and can be viewed in 3D.

People visit a 3D painting exhibition in Warsaw, Poland on Sept. 12, 2020. The exhibition displays over 60 replica paintings, which have been modified and can be viewed in 3D.

A woman views a painting at a 3D painting exhibition in Warsaw, Poland on Sept. 12, 2020. The exhibition displays over 60 replica paintings, which have been modified and can be viewed in 3D.