Final answer:
The concept of a spiraling curriculum is based on the theories of Jerome Bruner, who believed in building upon existing knowledge in a progressively complex manner.
Step-by-step explanation:
The concept of a spiraling curriculum, where learners continually build knowledge on what they already know, has its basis in the theories of Jerome Bruner. Bruner advocated for the idea that education should be a process of building upon what has already been learned, emphasizing a continuously increasing complexity of understanding, which aligns directly with the idea of the spiral curriculum. This is distinct from the theories of Lev Vygotsky, who focused on socio-cultural development, Lawrence Kohlberg who was concerned with moral development, and Benjamin Bloom who is known for creating a taxonomy of educational objectives to guide curriculum and instruction design.