Write a Wikipedia-style summary of the history of cornrows. It should be no more than 150 words. Include information on the gradual change of their function. You don't have to use actual dates.
The term "cornrow" (also referred to as "canerow" in the Caribbean territories) refers to a method of braiding the hair very close to the scalp. It is believed that the word is derived from the corn or cane fields that enslaved people were forced to work between the 16th and 19th centuries. Although this hairstyle is now seen as more of a fashion statement, it held much more practical uses during slavery. For example, people of color would use the designs of their cornrows as maps to remember where they had hidden food, tools and other necessities or to show the paths that were safe to travel on their quest for freedom. The braid itself could also be used to hide small objects and food items such as rice to take back to their living quarters.