Final answer:
The main characteristic of the Spanish Enlightenment (Neoclassicism) period was a focus on reason, rationality, and order, with an emphasis on imitating the classical works of ancient Greece and Rome.
Step-by-step explanation:
The main characteristic of the Spanish Enlightenment (Neoclassicism) period was a focus on reason, rationality, and order. Artists and writers during this time sought to imitate the classical works of ancient Greece and Rome, emphasizing clarity, simplicity, and balance in their compositions. They rejected the ornate and extravagant styles of the Baroque period and instead embraced a more restrained and intellectual approach to art and literature.