Garval tends to work by thematic groups that, although diverse, are linked by the same overarching idea: the apocalyptic vision of disaster emanating from human misery. His work uses allegory to examine moral lightness through exuberance and a monumental nature, in a style that sums up an expressionism with hues of Baroque reflected in its form and content. The painting Sonámbulos (Somnambulists), which was acquired by the MUSA in 2003, is part of the series Rituales (Rituals). It shows a group of giant and deformed characters with a mixture of real and fantastical characteristics that move through the water, wandering, estranged by despair, as if they are looking for something lost.