Final answer:
Plato considered the spiritual world, which is the world of Forms and the basis of his Theory of the Ideal Forms, to be more real than the physical world. The ultimate reality, in his view, is eternal and can only be truly understood through intellectual contemplation, making him an advocate of idealism.
Step-by-step explanation:
Plato considered the spiritual world or the world of Forms to be more real than the physical world. According to his philosophy, the things we perceive with our senses are merely shadows of a higher, truer reality that is eternal and unchanging, encompassing abstract entities such as goodness and beauty.
This ultimate reality is the seat of all truth, beauty, justice, and wisdom, which can only be apprehended through the mind via serious contemplation and discussion. Plato's Theory of the Ideal Forms postulates that the Forms are more 'real' than their physical counterparts, thus asserting his commitment to idealism, where the essence of reality is non-material and is more significant than the material world we experience.