The term is a Japanese word that literally means "realm of demons/monsters" or "uncanny realm" or forsaken place, and hellhole.
In Zen, Makyà  is a figurative reference to the kind of self-delusion that results from clinging to experience. Makyà  used in a broad sense refers to people's attachments to experiences in their everyday lives. However, makyà  may also be used in a more specific sense, referring to illusory experiences that sometimes occur during Zen meditation.
In Philip Kapleau's The Three Pillars of Zen, Hakuun Yasutani explained the term as the combination of "ma" meaning devil and "kyo" meaning the objective world. This character for "devil" can also refer to Mara, the Buddhist "tempter" figure; and the character kyo can mean simply region, condition or place. Makyà  refers to the hallucinations and perceptual distortions that can arise during the course of meditation and can be mistaken by the practitioner as "seeing the true nature" or kenshà Â. Zen masters warn their meditating students to ignore sensory distortions. As Hakuun Yasutani states:
Makyà  can take many different forms depending on an individual's personality and temperament. They can occur in the form of visions and perceptual distortions, but they can also be experiences of blank, trance-like absorption states. In the Zen school, it is understood that such experiences â however fascinating they may be â are not a true and final enlightenment.
John Daido Loori offers a similar description of makyà  in The Art of Just Sitting. Loori writes:
Again, experiences of makyà  vary in form, and many Zen teachers do not recognize such experiences as signs of enlightenment. Equating makyà  with enlightenment is instead seen as a form of attachment to experience.
Robert Baker Aitken described makyà  as a class of delusions. He mentioned several examples of makyà  outside of Zen meditation, including hearing heavenly voices, speaking in tongues, hallucinations such as a flock of white doves descending into one's body, and experiences of astral projection. Aitken thought makyà  might be valuable to people interested in the rich potential of what human minds can experience, but he believed makyo had little or nothing to offer people interested in personal insight.
More specific to Zen, Aitken claimed that makyà  indicate progress in meditation. Makyà  indicate that people have passed beyond superficial stages of thinking about Zen and their meditation. Yet, Aitken considered it a grave mistake to equate makyà  with something final or ultimate. He wrote:
Yet again, makyà  appear in a great variety of forms, but they are not considered signs of enlightenment.
Experiences comparable to makyà  occur in other meditative traditions. In some Hindu schools, experiences similar to makyà  are regarded as a product of the sukshma sharira, or "experience body", in its unstable state. Such experiences are viewed as another form of maya, the illusory nature of the world as apprehended by ordinary consciousness. Tibetan contemplative literature uses the parallel term nyam, which fall into three categories, usually listed as clarity, bliss, and non-conceptuality. Many types of meditation phenomena can be classed under this rubric, and are generally tied to the reorganization of the body's subtle energies that can occur in meditation. See Dudjom Lingpa, (cited in Wallace, the Attention Revolution), and Padmasambhava (in Treasures from the Juniper Ridge) for more specific examples.