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My instrument building is based on a type of semi hollow building technique. Namely, the base is not classically hollow, or drilled with any holes, but is completely carved with small pyramid blocks. That technique is called the Wreck Pyramid System, the WPS. The technique is nothing new actually. It is used in all kinds of testing rooms, studios or elsewhere. I, on the other hand, took the idea from the B&W loudspeaker company, model B&W DM302. They had a series of loudspeakers with randomly arrayed pyramids at the back of the speaker box as a kind of a solution to the problem of coloration resonances inside small cabinets. So I did the same with basses and guitars. I carved the entire body with pyramids. The sound that I was chasing was piano-like crystal clear, modern and detailed.
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By positioning pyramids deeper, the sound is thicker, acoustic like, and if they were closer to top, the sound is thinner and clearer.