Japanese scientists invent floating 'firefly' light

Japanese engineering researchers say they have created a tiny electronic light the size of a firefly which rides waves of ultrasound, and could eventually figure in applications ranging from moving displays to projection mapping.
Read more: https://www.reuters.com/article/us-japan-lights-floating/japanese-scientists-invent-floating-firefly-light-idUSKCN1G7132?source=Snapzu