In “Alice’s Adventures in Wonderland,” Alice’s tears create the Pool of Tears.
After drinking from the bottle and then eating cake, Alice grows to an enormous size. Frustrated because she cannot reach the tiny door to the garden, she begins crying so profusely that her tears form a pool around her. When the White Rabbit’s fan makes her shrink again, Alice finds herself swimming in the water made by her own tears.
The scene occurs in Chapter II, “The Pool of Tears,” one of the book’s earliest episodes. Alice soon encounters a Mouse in the pool, and the two later reach the shore and join the absurd Caucus-Race. The tears are therefore not produced by the Mouse or another Wonderland character; the pool is explicitly Alice’s own.
A common mix-up comes from adaptations, which sometimes rearrange or add the animals Alice meets in the pool. Lewis Carroll’s 1865 novel makes the source unmistakable: Alice’s emotional reaction to her changing size creates the water.