The statement that Alice “had begun to think that very few things indeed were really impossible” records a rapid recalibration of expectation. In the schoolroom, Alice has learned categories that separate the possible from the impossible; she even rehearses terms like “Latitude” and “Longitude” during her fall. Yet Wonderland’s early violations—the talking White Rabbit with a watch, the bottomless descent, a key that opens a door too small for a human—erode that inherited map. The line shows her adopting a pragmatic openness: if the world is behaving strangely, she will suspend default judgments and see what follows. It also reveals a child’s imaginative elasticity turning into a working method. Instead of despairing at the tiny door, she hypothesizes a solution—collapsing “like a telescope”—and treats it as hypothetically attainable. The narrator’s free-indirect closeness to Alice’s thoughts underscores that this is not cosmic philosophy but immediate problem-solving. The sentence thus functions both as a thematic thesis for the book’s logic-play and as an enabling condition for plot: only a mind that deems the “impossible” negotiable will drink from a mysterious bottle or later test a mushroom. Wonderland will keep presenting absurd constraints; this line records the moment Alice decides to meet them with experiment rather than doctrine.