What makes you, You?

Last year I had a very uhm... teenage "in love" kinda lecturer in Engineering Skills and Design.

She told us this, well asked:

" There is a guy lets call him Jorg. Jorg just got a job working on a ship called... Perdita. Perdita is a classical ship made completely of wood (bear with me..). Jorg's job is simple: remove all the worn pieces of wood from Perdita."

"Jorg had a dream from when he a boy. To have his own ship.He thus always kept the wood he would remove from Perdita and then when he had removed all the wood that made up Perdita he Built his own ship. It was Identical to Perdita and he named it Penita."

The question now is: Is Perdita still Perdita or is Penita now Perdita? If Perdita is not Perdita anymore, when did she stop being Perdita? Humans change constantly and I can think of eating and having my cells renewed or me changing my views everyday about things. I like slender girls untill Jill, Jennifer and Jordan. I like Peach until I Thabz. When do I stop being me?

Can anyone then make a commitment such as mariage if you know you will not be the same tommorow? (of you change). 

This was one of my lectures last year as much as I can remember. No right or wrong answer think critically about this...