Clever Halloween Hack Uses Sound Waves to Simulate a Spooky Doodling Ghost

There ’s really no unseasonable means to decorate for Halloween . It ’s the effort that number , even if all you do is thresh about some Cucurbita pepo on the porch , or fix up an inflatable enchantress on the lawn . But there are those that go above and beyond the call of tariff , likeDan Beaven , who leverage somecutting - bound levitation techto make itlook like ghosts are in reality veridical .

It has n’t made its way into consumer gizmo just yet , but scientists have project out how to make objects hover without the need for high - power magnets . The engineering is n’t move to make hoverboards a real thing any time soon , but in science lab trial , arrays of ultrasonic transducer — essentially speakers that bring out sound outside the range of human hearing — can generate sound waves firm enough to causelightweight polystyrene nut to float , and even ensure the movements of asmall foam beadwork floating in mid - air . It ’s raging stuff , but the research , at least in its current figure , has n’t had any practical applications — until now .

It ’s a wonderfully spooky essence , and one that ’s laborious to figure out how it function . There ’s no visible authorship cock making the baking powder move , and no other obvious indicators given the good wave are inconspicuous and inaudible . Beaven eventually — before Oct. 31 rolls around , we trust — plans to extend the setup to use two side - by - side transducer arrays to create a larger penning control surface for a spirit to communicate through , which should take into account for longer , creepier messages to magically appear .