What do the gifts that Clarisse gives Montag represent?

Montag meets 17 year-old Clarisse on the way home after work one night. Among other things, she asks him if he, as a fireman, reads the books before he burns them and if he is happy. Both questions startle him because reading books is illegal and being happy seems never to have crossed his mind. Like these two questions, Montag notices this young neighbor girl doing things that people in their society don't normally do or even think about doing. For example, Montag curiously notices when Clarisse shakes walnuts out of a tree and knits a sweater. This isn't behavior suited for "normal" people in Montag and Clarisse's society and that forces him to pay attention to something outside of the social and cultural norms that he is used to. The following is the passage that details the gifts that Clarisse gives to Montag:

. . . three or four times he found a bouquet of late flowers on his porch, or a handful of chestnuts in a little sack, or some autumn leaves neatly pinned to a sheet of white paper and thumbtacked to his door (28).

First of all, the fact that someone is giving gifts without expecting anything in return is symbolic, because Clarisse does something others in society don't do: she thinks of others. These random acts of kindness seem radical in nature and represent another time lost to those living in Montag's world, but they represent an age old ritual called "making friends." As a result, the gifts represent friendship and a connected emotional feeling that Clarisse wants to express to Montag. In fact, she tells him that she likes him and doesn't expect anything from him when he asks why he feels as though he's known her for years. Notice, too, that the flowers, the nuts, and the leaves all come from nature and the natural world around them. In Montag's society, people are usually distracted by digital, loud, and manmade things such as seashells, TVs, and fast cars. By giving Montag gifts from nature, Clarisse not only demonstrates her childlike curiosity and friendship, but she also uses those gifts to represent the forgotten natural world around them that many in their society miss out on enjoying.