Final answer:
Vasily Kandinsky's painting Improvisation 28 was meant to express inner spiritual experiences through non-objective forms, reflecting his belief in the emotional and spiritual power of abstract colors and shapes.
Step-by-step explanation:
The function of Vasily Kandinsky's painting Improvisation 28 (second version) is primarily to express an inner spiritual reality through non-objective forms. Kandinsky believed that color and form could directly influence the soul and convey spiritual concepts. This belief in the expressive power of color can be seen in his works, including the aforementioned Improvisation 28, where abstraction conveys emotion separate from physical depiction. In the provided context, Composition VII is highlighted as an example from a set of Kandinsky's paintings that demonstrate his theories using rolling, turbulent forms of colors and shapes.
It is evident from Kandinsky's body of work and his philosophical writings that he was deeply engaged with the ways colors could affect emotions and convey spiritual ideas. His affiliation with the Der Blaue Reiter group further underscores his commitment to the expression of spirituality through art, particularly through the symbolism of color, as seen in his use of blue, which he considered the primary color of spirituality.