Read the passage, and answer the question that follows.

Our favourite amusement during that winter was tobogganing. In places the shore of the lake rises abruptly from the water's edge. Down these steep slopes we used to coast… For one wild, glad moment we snapped the chain that binds us to earth, and joining hands with the winds we felt ourselves divine!

Which of the following is used as a symbol in this passage?

lakeshore
winter
coast
tobogganing