Chinese poet and palindromist Su Hui lost her husband to a concubine in the fourth century. To console her grief and to lure him back, she composed an ingenious array of 841 characters that can be read forward, backward, horizontally, vertically, and diagonally:

Each seven-character segment corresponds to a poetic line, and can be read in either direction. At the end of each segment, “you encounter a junction of meridians and can choose which direction to go,” explains anthologist David Hinton. “You can begin anywhere, and the poem ends after four lines have been chosen. This structure generates 2,848 possible poems.”

It’s said that Su Hui’s husband was so moved that he sent away the concubine and rejoined her.