It was an important feature of the design of transmission lines - presumably designed to make a finite thing behave as though it was pretty much endless ? ISTR Radford and Bailey got into it in quite a big way.
VB
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Start with these
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Oooh, a threesome…
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First attempt at 3D printing horns. After much faffing with STL files and trying to get different slicers and meshing tools to accept them, I ended up with this.
Test prints at 1/3 scale (they’re about 2” across). Slicer needs some tweaking to dial in settings, but promising.
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Looks good, what size can the printer handle?
235x235x250. Not enormous, but enough for tweeter horns, or perhaps a mid, if done in two parts.
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Is this for new horn project with the vertical bass horn?
Obvious sex toy is obvious
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No, just playing.
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Only if you have a shrunken chode. 
Pretty damn cool is that 
Impressive. Nicely done.
I’ll have an 800Hz one with a 1" throat please. Will pay two Turans.
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Does that mean four Turans for stereo?
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Looks like a prototype bog were the cistern has a built in extractor fan.
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Hopefully a metaphor for Trumps current situation
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@Jim has ordered two
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Are the voids just to save material?
They’re a bit small to hide bodies. 