In April 1977, a patient from Harborview Medical Center known as Maria claimed to have experienced an out-of-body experience. During her OBE she claimed to have floated outside her body and outside the hospital. Maria later told her social worker Kimberly Clark that during the OBE she had observed a tennis shoe on the third floor window ledge to the north side of the building. Clark then went to the north wing of the building and by looking out of the window could see a tennis shoe on one of the ledges. Clark published the account in 1984. The story has since been used in many paranormal books as evidence that a spirit can leave the body.