“I knock on the door, I say ‘hello,’ and I shake hands,” the photographer Zofia Rydet said of her creative process. In 1978, she set out to photograph the inside of every household in her native Poland—not a small feat, especially considering she had just turned 67. The project would consume decades, taking her through the cold rural regions of the country and yielding a staggering 20,000 negatives. “Even if they don’t publish it,” Rydet added, “this will remain, not art perhaps, but a document of the times.” She died in 1997, and her project did achieve landmark status. Hundreds of these photographs are now on view in London—a window into a rapidly changing world. —Elena Clavarino