During Undergrad at the University of Michigan, I took a course with Elizabeth Goodenough. During this class, she repeatedly highlighted the need for and power of children having their own secret spaces in childhood. It was constantly reinforced how powerful it is for children to have their own safe private space to be themselves in.
With that in mind, I have created a yearly tradition of Fort week. During Fort week the students design and create their own little blanket and cardboard spaces. There are forts, lean-to's, and secret hidey holes. They work, play and create in their little spaces. At the end of the week, we will have a pajama day. We will try to preserve some of the forts for the rest of the year, but there are space and practicality issues involved. We had a lot of fun building and using our forts.
For more information about the book 'Secret Spaces of Childhood' by Elizabeth Goodenough, see: https://www.press.umich.edu/11854/secret_spaces_of_childhood