five theories of illusion

five theories of illusion or erroneous perception – 

1. Ātmakhyāti (Yogacara theory of subjective apprehension), 
2. Asatkhyāti (Madhyamaka theory of the nonexistent), 
3. Akhyāti (Prabhākara’s theory of non-apprehension), 
4. Anyathākhyati (Nyaya theory of misapprehension) and 
5. Anirvacanīyakhyāti (Advaita Vedanta theory of apprehension of the indeterminate), developed by five schools of thought

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