To learn more about Sand Mandalas, I would recommend online resources such as: 
- the Wikipedia article on Sand Mandala,
- any of the various documentaries about Sand Mandala on YouTube,
- any of the interviews by famous Sand Mandala artist Losang Samten, and 
- articles about Sand Mandalas on Tibetan websites

Here is a brief overview of Karma Yoga:
Karma Yoga, in Hinduism, is one of paths that helps a person to attain spiritual liberation. Karma Yoga teaches one to be dedicated to thier duty, without being emotionally attached to the outcome, whether it be success or failure. One should perform thier work selflessly, with the intention of doing the right thing, impartial to the interest of others.

As your assistant, I am happy to help as always.
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