Jackie Palmer only has one cat named Ellie, but she started a blog documenting pictures of other people’s cats looking out the window. Her Tumblr blog called “Oh, Hello Window Cat”jumped from 30 to upward of 9,000 in a matter of days. “I thought my Tumblr had a virus at first, to be honest,” she says. “But people like looking at pictures of cats in windows, I guess.”

To read more about people’s love of seeing pictures of other people’s cats, click here.