Step 1: Understanding the Concept: 
G. R. Santosh was a leading artist of the Neo-Tantric art movement in India. Tantric philosophy often explores the concept of cosmic duality and the union of opposing, yet complementary, forces as the source of all creation. 
 
Step 3: Detailed Explanation: 
In Hindu philosophy, particularly Samkhya and Tantra, "Purusha" represents the male principle—pure consciousness, the observer, and the unmanifest spirit. "Prakriti" represents the female principle—nature, creative energy, and the manifested world. The cosmic union of Purusha and Prakriti (or Shiva and Shakti, which represent a similar concept) symbolizes the creation of the universe and the ultimate state of non-duality. G. R. Santosh's paintings are renowned for their abstract and symbolic representation of this very union, using geometric forms and vibrant colors to depict the interplay between these two fundamental energies. 
 
Step 4: Final Answer: 
The cosmic union of human energy in G. R. Santosh's tantric paintings is a direct representation of the philosophical concept of Purusha and Prakriti. 
Rearrange the following parts to form a meaningful and grammatically correct sentence: 
P. a healthy diet and regular exercise 
Q. are important habits 
R. that help maintain good physical and mental health 
S. especially in today's busy world