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

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Text this: Changes of colour appearance due to changes of shape of colour sample and background colour