Final answer:
August Mau identified four styles of Campanian art in Pompeii: the Incrustation Style, the Architectural Style, the Ornate Style, and the Intricate Style.
Step-by-step explanation:
August Mau identified four styles of Campanian art in Pompeii. The First Style, also known as the Incrustation Style, featured brightly painted faux-marble walls with stucco moldings. The Second Style, or the Architectural Style, showcased naturalistic architectural scenes framed by marble blocks. The Third Style, referred to as the Ornate Style, used broad, monochromatic planes of color with intricate details. And the Fourth Style, known as the Intricate Style, combined elements of the previous styles and incorporated central panel pictures with a wider range of themes.