The “S” of today’s devices from Packard’s The Poet’s Dictionary:  A Handbook of Prosody and Poetic Devices is

Sonnet:  A fourteen-line poem usually with octet/sestet separation of eight- and six-line formations, usually with a RHYME scheme in either Shakespearean or Petrarchean sequence.

I break from the norm here and, rather than share an original poem, share something from the god of sonnet-writing, William Shakespeare.

75
So are you to my thoughts as food to life,
Or as sweet-seasoned showers are to the ground;
And for the peace of you I hold such strife
As ‘twixt a miser and his wealth is found;
Now proud as an enjoyer, and anon
Doubting the filching age will steal his treasure;
Now counting best to be with you alone,
Then bettered that the world may see my pleasure;
Sometime all full with feasting on your sight,
And by and by clean starved for a look;
Possessing or pursuing no delight
Save what is had or must from you be took.
Thus do I pine and surfeit day by day
Or gluttoning on all, or all away.

– William Shakespeare