Eduardo Castrillo used animal motifs such as fishes to convey his complex ideas, which start from the aesthetic conviction that all things stand within a higher dynamic relationship of power.
He combined fish arrangements with objects from the abstract sphere into his assemblies. Castrillo has done mobiles of chrome and plexiglass, as well as stabiles, huge environmental sculptures, which are more abstract.
The search for the monumental in the shape of things — Contemporary sculptors such as Castrillo see through their works in a new light. The sculptures were not so much to “decorate” spaces in the traditional manner as to function in them and to be both aesthetically pleasing and practical. This implied a direct relationship between sculpture and the space in which it was housed.
This work is typical of the artist’s geometric sculpture, showing how he manipulated the expected relations between space and solid. Castrillo succeeded in the domain of form and dynamics. His goal for the work was to depict a "synthetic continuity" of planes. Throughout his career, Castrillo has worked in both micro and macro forms, as in jewelry with its small, exquisite forms and in public sculptures of towering dimensions.