We count the Omer between Pesach and Shavuot to purify ourselves through the 49 levels of purity ,to reach Holiness ,so we can receive the Torah on Shavuoth.The Omer count brings One-ness with HaShem.The very word 'Omer' in Hebrew,is 316 in Gematriah & 3+1+6=10 which is the Ten Commandments,the basis of moral Law.The number '10' also represents Creation,where HaShem Created the world with 10 prononcements so when we count the Omer,we are also helping to create a Holier world around us and we help bring HaShem's Shechinah to this physical world.The number '10' ,breaks down further to 1+0=1 representing our Oneness with HaShem's Oneness,gained when counting the Omer.So every night that we count the Omer,we are bringing such Holiness to this world,that we can only begin to understand if we open ourselves up to the true beauty of HaShem's wonderful Creation.To purify ourselves,is to purify all we see and all we come in contact with and so,that which is in contact with us automatically is made more purified.When we can purify ourselves and the world around us then HaShem can once again dwell among us.