Duality is Creation.

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If you write on a white board with white chalk, nothing will be visible. You need to write with a black chalk or writing material on a white board. It is contrast that make the writings visible. Hence there is duality in nature. If everything is Joy, you may not enjoy the joy really. Only when you are confronted with sorrow, you will come to experience the joy. Like summer and winter, pleasure and pain, sweet and bitter, day and night, life becomes tolerable for us. If you feed a man all through the week with only idly and chutney, he would not turn back again. We need variety in this world to sustain us. Even in the form of God, we are not satisfied with one form alone. Varieties of forms of god render the worship a pleasure. Even in Ashrams where disciples study under "Rishi" undergo several varieties of studies. In addition to scriptures, they are taught archery, horse riding, collecting firewood, tending greeneries and any amount of knowledge, the preceptor possess is transferred to the disciples. If all through the day, you are reciting slokas or manthras, your head will be burdened. Hence there is change in the schedule. Even Swami himself has proclaimed, "There was no body until he created all this variety". Actually the creation is an expression of Love. He want to love himself. It could be possible only when there is a second entity. Hence this creation. Sairam.