Kali - Mahavidya

Kali stands on Shiva

Kali is one of the Mahavidyas. Krishna avatar of Vishnu is portrayed at the bottom.

Image of Satguru Sivaya Subramuniyaswami
A clean personal environment, wearing clean clothes, bathing often, keeping the room spotless where you meditate, breathing clean air, letting fresh air pass through your house, is all very important in the fulfillment of purity.
—Gurudeva