Everybody loved those plasma balls when they were a kid, right? Flickering red and blue light inside the glass sphere, then when you touch it blue forks archs out to meet you. Well, they’re back and now they’re small enough to fit neatly on your desk and they run direct from a USB port. It’s a whole lot of science inside these 3 inch balls, plus they look especially great if you flick the lights off.

Product dimensions: 155 x 110 x 110 mm