[3] His works are housed in numerous prestigious public and private collections throughout the world[4] and his murals still adorn the walls and gigantic dome of Jabalpur's historic Shaheed-Smarak or Martyrs'-Memorial Auditorium even after more than half a century, though now demanding conservation.

He was the youngest of the three sons of renowned Gandhian Beohar Rajendra Sinha - an acclaimed scholar, historian,[7] theologian,[8] littérateur,[9] Hindi-activist,[10] Ramayana-authority and, to a lesser extent, a journalist and a politician[11] - who happily embraced numerous terms as political-prisoner while leading the Indian independence movement as a part of Satyagrah.

To her teenager son, in addition to allowing an extra share in the sumptuous prasad, she also used to recite captivating narratives and melodious hymns that often incorporated conventional explanations as well as diverse interpretations of those motifs.

[3] Even after the death of Rabindranath Tagore in 1941, Rammanohar's father Beohar Rajendra Simha continued visiting Shantiniketan to meet his friends Banarsidas Chaturvedi, Hazari Prasad Dwivedi, Kshitimohan Sen[15] and others.

As a part of his postgraduation during 1951 to 1953, along with gaining expertise in Fresco-secco under Nandalal Bose, he chose to specialize in Zen painting under Yu Wan-shan[4] who founded the Huafan University in Taiwan – the only institution outside India that uses Lion Capital of Ashoka as its logo.

"[19][24] In fact, in addition to all the embellishments, most of the basic sketches, line-drawings (pictured) and designs for final illumination of the original manuscript of Constitution of India were executed by Rammanohar,[25] who was the senior-most and favorite[13] disciple of Nandalal Bose.

Of particular significance are the one depicting the Quit India Movement (pictured) which has also been published in Encyclopædia Britannica[28] and the one on Rani Durgavati, which has been credited with the very first unambiguous painting of the valiant warrior queen of the Gondwana-fiefdom of Garha-Mandla who dared to challenge Akbar's mighty army in order to safeguard her country's independence.

[29][30] Likewise, Rammanohar also executed Fresco-secco mural[31] depicting the birth of Gautama Buddha[32] on the walls of Kala Bhavana hostel building in Visva-Bharati University, Shantiniketan.

[31] In preparation for the 59th annual congregation of national leaders in Kalyani, West Bengal in 1954, Rammanohar and his team illuminated the entire venue,[33] especially the gateway and the stage, with panels and posters on nationalistic themes using locally procured biodegradable material, natural earth colours[31] and Khadi.

While in China, Rammanohar worked with great maestros Qi Baishi, Li Keran, Chen Banding, Pan Tianshou, Wu Jingding, Wu Zuoren, Li Kuchan, Fu Baoshi, Yu Fei'an, executed numerous artworks jointly that include the famous painting Meishan Bridge[34] pictured drying in the background, and interacted with a few political top brass after Phase-I of the Chinese Hundred Flowers Campaign.