Space is unoccupied interstice. The organs of hearing consist of space. One knowing the science of elements endued with form should know that ether has sound for its attribute.
अन्तरात्मकमाकाशं तन्मयं श्रोत्रमिन्द्रियम्। तस्य शब्दं गुणं विद्यान्मूर्तिशास्त्रविधानवित्॥