There are, according to Zen, the four classes of religious and philosophical views, technically called the Four Alternatives,[FN#201] of life and of the world. The first is 'the deprivation of subject and the non-deprivation of object' that is to say, the denial of subject, or mind, or Atman, or soul, and the non-denial of object, or matter, or things--a view which denies the reality of mind and asserts the existence of things. Such a view was held by a certain school of Hinayanism, called Sarvastivada, and still is held by some philosophers called materialists or naturalists. The second is the 'deprivation of object and the non-deprivation of subject'--that is to say, the denial of object, or matter, or things, and the non-denial of subject, or mind, or spirit-a view which denies the reality of material object, and asserts the existence of spirit or ideas. Such a view was held by the Dharmalaksana School of Mahayanism, and is still held by some philosophers called idealists. The third is 'the deprivation of both subject and object'--that is to say, the denial of both subject or spirit, and of object or matter-a view which denies the reality of both physical and mental phenomena, and asserts the existence of reality that transcends the phenomenal universe. Such a view was held by the Madhyamika School of Mahayanism, and is still held by some religionists and philosophers of the present day. The fourth is 'the non-deprivation of both subject and object'--that is to say, the non-denial of subject and object--a view which holds mind and body as one and the same reality. Mind, according to this view, is reality experienced inwardly by introspection, and body is the selfsame reality observed outwardly by senses. They are one reality and one life. There also exist other persons and other beings belonging to the same life and reality; consequently all things share in one reality, and life in common with each other. This reality or life is not transcendental to mind and body, or to spirit and matter, but is the unity of them. In other words, this phenomenal world of ours is the realm of reality. This view was held by the Avatamsaka School of Mahayanism, and is still held by Zenists. Thus Zen is not materialistic, nor idealistic, nor nihilistic, but realistic and monistic in its view of the world. [FN#201] Shi-rya-ken in Japanese, the classification mostly made use of by masters of the Rin Zai School of Zen. For the details, see Ki-gai-kwan, by K. Watanabe.