So, for example, the walls in the Alhambra -- I can take all of these tiles, and fix them at the yellow place, rotate them by 90 degrees, put them all back down again and they fit perfectly down there.
たとえばアルハンブラの壁のタイルなら 黄色の点の位置を軸にして 90°回転すると 完全にもとの模様と一致します