Mosallam did not receive artistic training at any institution. Working with a very particular technique, based on painted reliefs, Mosallam recalled from his days in the village scenes of traditions and celebrations, and from his years in exile scenes of resistance and fighting. He worked at the maintenance department of the
Jordanian Air Force before joining the
Palestine Liberation Organization (PLO) in the late 1960s, which sent him and his family to
Libya. While in Libya, Mosallam learned his special technique and turned to art. The hard conditions of life in the Diaspora, the struggle for Palestine, direct and artistic militance, are all factors which determined Mosallam's artistic production in both subject matter and technique. For many years he had his studio in the Palestinian quarter of
Damascus, still called “the Yarmouh Camp”, together with the late Palestinian artist
Mustafa Al Hallaj. From 1992 until his death in 2020 he lived and worked in Amman, Jordan. Mosallam's subjects reflect his life, he worked while living in the refugee camps, at first in
Lebanon and later in
Syria. He worked under bombardment during the
siege of Beirut in 1982, and he succeeded in holding an exhibition in the midst of the ruins of the city. At that time, his subjects were linked with the feelings and needs of the people who shared this hard life with him. Through his work, Abdul-Hay strengthened the resistance of a people who are struggling on all levels to survive. His paintings depict the life of the
Palestinians – the village weddings,
Ramadan nights, gatherings, farmers and traditional dancers, all vividly painted on detailed reliefs and inscribed with traditional songs and poems. In the works of Mosallam, the woman appears almost as the reason for life for the man. She embraces the man, often a palm tree at whose roots a man is seated playing music for her. At other times, she is a boat, naked, with long hair, carrying the man. Always, the woman appears stronger than the man as if the artist is going against the current, challenging the subordinate role of women in the
Arab World. ==Technique==