I wandered lonely as a cloud
That floats on high o'er vales and hills,
When all at once I saw a crowd,
A host, of golden daffodils;
Beside the lake, beneath the trees,
Fluttering and dancing in the breeze.

Continuous as the stars that shine
And twinkle on the milky way,
They stretched in never-ending line
Along the margin of a bay:
Ten thousand saw I at a glance,
Tossing their heads in sprightly dance.

The waves beside them danced, but they
Out-did the sparkling leaves in glee;
A poet could not be but gay,
In such a jocund company!
I gazed—and gazed—but little thought
What wealth the show to me had brought:

For oft, when on my couch I lie
In vacant or in pensive mood,
They flash upon that inward eye
Which is the bliss of solitude;
And then my heart with pleasure fills,
And dances with the daffodils.

This slightly creepy, but interesting video, is a poem about Daffodils. After researching some articles and re-reading the poem several times, I have come to learn that Wordsworth wrote this poem about the time when he was walking through a field of Daffodils with his sister, Dorothy. In this poem the first line says "I wandered lonely as a cloud" (which is also the alternate title for this poem) this line is false though, because he was in fact with his sister. This is proven because in Dorothy's journal, she writes about this walk with her brother. She also mentions how the Daffodils are dancing and how they seem to be laughing in the wind. Wordsworth includes these lines in his poem (stanza 2, line 6; stanza 4, line 6.) They were walking next to the waterside, and that's why Wordsworth says "besides the lake.." and "The waves besides them danced." Wordsworth may start out the poem with, "I wandered lonely as a cloud" because he wants to set up an image in the readers head. Wordsworth is known for using a lot of imagery and seeing beauty in a different way then most people, especially in the times that he wrote the poem. He is setting up this beautiful scene for the readers to have in their mind of the Daffodils that Wordsworth him self saw. There may or may not be a deeper meaning to this poem, as I see it, this is a poem about beauty and the way Wordsworth describes this scene is unique to any other poet. This is why he was such a popular poet and how Romanticism started. Lets look up the definition for Romanticism...

romanticism(ro·man·ti·cism)
Promanticism:/rōˈmantəˌsizəm, rə-, roʊˈmæn(t)əˌsɪzəm/
noun
1 (often Romanticism)a movement in the arts and literature that originated in the late 18th century, emphasizing inspiration, subjectivity, and the primacy of the individual.

Look at the last part of the definition, "emphasizing inspiration, subjectivity and the primacy of an individual" Wordsworth included all these definitions in his poem. He was inspired by the field of Daffodils to write the poem, and he writes the poem in a way so the reader can see what Wordsworth himself saw of the Daffodils in the field by the waterside.

Wordsworth loved Daffodils and their beauty. This could be the reason that when his beloved daughter died, he made a garden full of beautiful Daffodils in her name. The garden was called Dora's Fields. It seems as if he wanted his daughter that he loved so dearly, to be remembered by something as beauteous as herself.