Below the article of mr. Deléletraz is reproduced partially for the purpose of reference.

(These files come from a private server, so it may be not as fast as you're used to)

The whole article can be found in the november 2001 edition of  Stereophile

On the following 4 pages mr. Deléletraz gives a rather correct explanation of how a transmission line works and why reflections occur when the transmission line is not properly terminated. (loaded with the characteristic impedance of the cable)

Only a small piece is of interest here: