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 __   _      ___      ______     ___              
| || | ||   / _ \\   /_   _//   / _ \\      ___   
| '--' ||  | / \ ||    | ||    | / \ ||    /   || 
| .--. ||  | \_/ ||   _| ||    | \_/ ||   | [] || 
|_|| |_||   \___//   /__//      \___//     \__ || 
`-`  `-`    `---`    `--`       `---`       -|_|| 
                                             `-`

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Text this: Split-ball resonator as a three-dimensional analogue of planar split-rings