It’s a metaphor
what the hell is that a metaphor for
the unicorn represents us all as people
the dylan sitting on it represents our thoughts, our hopes, and our dreams
We are the unicorn, crushed by all of the things we want to do with very little time to actually do it. As we struggle to do everything, our minds make what we want seem more close than they actually are.
After trying to make our dreams come true several times, we finally give up on them and just let them sit on our shoulders, forever reminding us that we are failures.