Text this: Color Groups Associated with Square and Hexagonal Lattices

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