Star Wars fans will be pleased to hear that they are one step closer to being able to use ‘the force’. The BBC has revealed that a team of engineers have designed a mechanism that can move and hold pea-sized objects from 30cm to 40cm away through the power of “holograms” made of sound waves. The pretty cool video above shows how the holograms manipulate objects, finishing with a “cardboard UFO” circling the speaker grid to show its “tractor beam” capability. A development most interesting it is…