Only other person I have heard mention this was my late husband.
From when I first knew him he told me that since he was young he kept seeing himself walking through a honeycomb but knew he was walking through his own brain.
He became quite obsessed with this as our years together went on . He had always said he would die young and it would be brain related - also always said that even his first name was an anagram of Brain = Brian
He died at age 42 with a brain aneurysm