For the past 16 years, I have spent at least 22 1/2 hours of every day completely isolated within a tiny, windowless cell in the Security Housing Unit at California's Pelican Bay State Prison in Crescent City. Eighteen years ago, I committed the crime that brought me here: burgling an unoccupied dwelling. Under the state's three strikes" law, I was sentenced to between 25 years and life in prison. The circumstances of my case are not unique; in fact, about a third of Pelican Bay's 3,400 prisoners are in solitary confinement; more than 500 have been there for 10 years, including 78 who have been here for more than 20 years. Unless you have lived it, you cannot imagine what it feels like to be by yourself, between four cold walls, with little concept of time, no one to confide in, and only a pillow for comfort - for years on end. It is a living tomb. I eat alone and exercise alone in a small, dank, cement enclosure known as the "dog-pen."I have not been allowed physical contact with any of my loved ones since 1995. I have developed severe insomnia, I suffer frequent headaches, and I feel helpless and hopeless. In short, I am being psychologically tortured. Now fellow SHU inmates and I have joined together with the Center for Constitutional Rights in a federal lawsuit that challenges this treatment as unconstitutional. I understand I broke the law, and I have lost liberties because of that. But no one, no matter what they've done, should be denied fundamental human rights, especially when that denial comes in the form of such torture. Our Constitution protects everyone living under it; fundamental rights must not be left at the prison door.