u/Embarrassed-Tell6778

Before I watched it I kept on seeing fanart of Simon with a mouth full of sharp teeth connected to his actual mouth and also saw fanart of him being connected to a tree but when I finally watched the movie I couldn't make the connections to the fanart. I think it's because I couldn't see it very well or there were more implications rather than you directly seeing it but I'm just extremely confused. Also what was the black box for?? Can someone explain it?