Sharp on one end
Rubber on th' other
Useful for writing
Like no other.

Not a quill and ink
For parchment or papers
Nor a scribe for stone
On which to chase ltr's.

Graphite or dyes, not lead
Are th' reasons
A mark survives
In all seasons.

But the rubber end serves
Us most well
When errors imparted
‘R not permitted to dwell.

Use of pencils (or pen and ink)
And sundry supplied
Are here to stay as words
To paper are best applied.

Sidi J. Mahtrow

http://www.poemhunter.com/poem/ode-to-a-pencil/