Similfuturus

"Force projection, also known as Similfuturus, was a Fallanassi Force technique recorded in the sacred Jedi texts. The technique allowed a Jedi to create an illusory doppelgänger of themselves that could be transmitted through the Force across vast distances." Yoda knew this, but he never expected a young, disease ridden boy to instinctively use such a technique in his agony.