The experiment involved engineers, many of whom work in the aerospace industry. They tied a two-meter tree to a structure with four wings. A small solid-propellant rocket engine allowed the tree to fly into the skies over the Mojave Desert in California.
Unfortunately, the engineers managed to do this not on the first try, but only on the fourth. You can watch how the tree takes off in the video below. Some symbolism is also possible here, we suggest coming up with it yourself.