mānasaṃ tadapītyeke naitad indriyabhāvataḥ / bhāvāt tadvikṛtāvasya vikṛteścopalambhataḥ // sarpādibhrāntivaccedam anaṣṭe 'pyakṣaviplave /
Some say it is mental, [but] this is not [correct] because [the illusion] exists when the sense organ is present and [because] it is perceived when [the sense organ] is disturbed. If it were like the snake-illusion [which is purely mental], it would cease even when the disturbance of the sense organ has not ceased.