HOLOGRAPHY  .... https://www.youtube.com/watch?v=eh2UDKhL_qs&list=TLXMqcLbQlIvY

Large scale hologram:  .... https://www.youtube.com/watch?v=rBq_DZolZN8

Airborne holographic projector: ... http://www.hidden-truth.org/secrecy/blue-beam-project-aka-airborne-holographic-project

... NOTE:  I don't think the airborne holographic projector got past the concept stage.  I don't think it works.