The first line of the poem "Portrait by a Neighbor" has five feet, known as pentameter. Each foot consists of two syllables, making a total of ten syllables in the line.
The line "The only way out is back" from the poem "Edge" contains an allusion to the myth of Icarus and Daedalus.
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A tetrameter line has four metric feet per line.
The first line can set the tone for the rest of the poem :)
The last line of a haiku poem typically contains five syllables.
O'Sullivan wrote a poem called In Mercer Street which contains several parts; the first line is "A piper in the streets today" and usually only the first part is quoted, with that title. However, the poem is rather longer.
Haiku
An example of a poem where the first letter of each line spells out a word is an acrostic poem. In an acrostic poem, the first letter of each line combines to spell out a word, message, or name when read vertically.
What is the poem's first line?
it provides an introduction to the rest of the poem