If we cannot imagine the outcome, we will never achieve it.
If we cannot set goals and dreams for ourselves and our students, we will not reach them. If students and teachers cannot see what is possible, they will not work for what they can't see.
In education, we need to be able to fail to then have the opportunity to grow from our mistakes. We can grow without failure, but failure pushes us to change if we are in growth mindset.
I love using the example of playing improv in games or music. In music, it actually takes a pretty good musician to be good at making things up as they go. They put a lot of practice into being artistic and creative.