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Śrīla Śridhara Mahārāja explains how the guru may approach the sincere disciple in various aspects, and is not confined in a visual mind/eye experience. He also mentions how Kṛṣṇa Himself states that He is non-different from the guru, and how this point should not be ignored.
From a talk at Śrī Chaitanya Saraswat Math, Navavdvīpa on Feb. 23rd 1982.