Simple Analogy to Trinity

A simple analogy to Trinity: you may think of "H2O" (chemistry component of water): it has forms of liquid (water), gas (water vapour), solid (ice). "H2O" is one thing but can appear in three forms.

Analogy to one God of three persons - Father/Son:
- God as Father/God as human form (John 1:1-14)
- Holy Spirit: God as Counselor/guidance to Christians (John 14:26).

Here're some links to more detail about Trinity :
http://www.geocities.com/Athens/Delphi/8449/trinity.html
http://www.bible-truth.org/Trinity.html
「三位一體」真神論:
http://lck.hkcampus.net/~lck-shy/trinity.htm