"Holographic projections" refers to a technology that creates 3-dimensional images or videos that appear to be floating in the air, giving the impression of something solid when in fact it's just light. Full definition
Also appearing this year in Greta Gerwig's solo directorial debut, Lady Bird, Smith plays the titular Marjorie, a woman living in a time when people can create holographic projections of their late family members. (deadline.com)
Notable changes this year include the lack of a heads - up display, opting instead to relay information via holographic projections off of the player's weapon. (denofgeek.com)
Rakkolainen is referring to the iconic Princess Leia hologram that emerges from R2 - D2's navel (video) and other holographic projections like it in the Star Wars movies, only actual holography requires no wispy clouds of moisture. (discovermagazine.com)