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 _    _      ___      _  _     _____     ______  
| || | ||   / _ \\   | \| ||  |  ___||  /_____// 
| || | ||  / //\ \\  |  ' ||  | ||__    `____ `  
| \\_/ || |  ___  || | .  ||  | ||__    /___//   
 \____//  |_||  |_|| |_|\_||  |_____||  `__ `    
  `---`   `-`   `-`  `-` -`   `-----`   /_//     
                                        `-`

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Text this: Self-imaging, self-healing beams generated by photorefractive volume holography