Lily Cummings visits with her grandparents over Skype several times a week. The 18-month-old loves showing off her baby dolls and stuffed animals, and even being “tickled” by her grandfather, who leans in toward the screen and pretends to go after her belly. So when Lily’s mom asked the San Francisco toddler where her Grandma Cath and Granddad live, the answer was simple.

They live in the computer.