Man locked in his signature

 Quite long way from learning the alphabet, then how to write, through "perfectly" shaped letters in primary school, till now, till my handwriting, my own signature. How many signatures did I leave on a paper during my life? Innumerable... It's so easy to leave a trace of your existence, but it's also so easy to leave it unnoticed.  What is the quality of traces we leave? Is it a plastic bag blowing in the wind? A good memory in someone's head? Marble monument? Idea implanted in few heads? Grass trampled for a while? 
 Is it better not to leave anything, than to add another rubbish to this huge wasteland called Earth? Pass unnoticed than to make a noise?