Which religious architectural innovation was specifically designed to amplify a speaker's voice in large gathering spaces before electronic amplification existed?

Throughout history, religious institutions have carefully designed their spaces and objects to enhance spiritual experience. From ancient temples to modern meditation apps, thoughtful product design has been crucial in facilitating worship and contemplation. This poll explores how different faith traditions have approached the design of sacred spaces and objects to meet both spiritual needs and practical considerations.

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Minbar (raised pulpit in mosques)
Stained glass windows in cathedrals
Buddhist prayer wheels
Hindu temple mandapas (pavilions)