The new S61 phone by CAT features a Flir thermal-imaging camera. This means you can take photos that show how hot or cold different things are around you.

Sure, it might be a tool designed to help plumbers work out where a blockage in a heat pipe might be, but to us it's an excuse to pretend we're the predator seeking out our enemies in thermal vision.

I took the phone around Barcelona to see what Spain's coolest city looks like through the S61's lens.

First up, this copy of the wonderful CNET magazine on a newsstand. I have no idea why the top is cooler than the bottom.