Freedom is just a matter of perception. 
One can feel free in closed walls and write Geeta Rahasya like Lokamanya Tilak did OR feel confined in open space under the sky.
Perception of self can change only when focus of self changes from external space to internal space.
There are no boundaries for internal space.
And once “i” establishes in internal space, it expands it’s external space becoming the free “I”.
Freedom is also not a physical expression of one’s existence.
It is an experience of one’s existence.
And to experience one’s existence all one needs is to BE!
There is no effort necessarily for BEING.
When all efforts end what remains is one’s BEING.
It is only in absolute stillness that one can truly BE.