Anechonoid
This looks like a listening device but is acutally a echo free hemisphere “quiet zone”- inverse sound mirror. The pyramid shaped spikes absorb incidental sound waves, thus providing acoustic sheilding to one side of the listeners head. The center being at approximately 1.5m high.
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This idea is a cross pollination between the geometries of the granite sound mirror i built in China and the Isolation chamber/Faraday helmet/throne (joint project with Jon philips) aka rejon.org. In order to work the spikes need to be made from a highly absorbent material that is also durable.