What is the difference between 'noticed' and 'watched' tiles?

What is the difference between 'noticed' and 'watched' tiles? - View of Golf Playground Between Rows of Tall Trees

When you mouse over a tile, some tiles say 'noticed' and some say 'watched'. What is the difference?

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Pictures about "What is the difference between 'noticed' and 'watched' tiles?"

What is the difference between 'noticed' and 'watched' tiles? - Brown Wooden Blocks on White Table

What is the difference between 'noticed' and 'watched' tiles? - Young female client in casual wear chatting on cellphone while sitting at table with cup of hot drink in cozy bookstore in afternoon

What is the difference between 'noticed' and 'watched' tiles? - Multiethnic couple with ceramic vases and pile of cardboard boxes

What's The Difference

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Antony Trivet, Brett Jordan, Ksenia Chernaya, Ketut Subiyanto