The last few weeks have seen a number of tech sites reporting on a robot which can find and point out Waldo in those “Where’s Waldo” books. Designed and built by Redpepper, an ad agency.

It's a veritable Fiesta-themed "Where's Waldo" challenge. "It was hard to pick what I was going to include and what I had to leave out," said Leal, who, when not making art, works at his family's ...