There were several interconnected traditions of painting in ancient Greece. Due to their technical differences, they underwent somewhat differentiated developments. Not all painting techniques are equally well represented in the archaeological record. The most respected form of art, according to authors like Pliny or Pausanias, were individual, mobile paintings on wooden boards, technically described as panel paintings. Also, the tradition of wall painting in Greece goes back at least to the Minoan and Mycenaean Bronze Age, with the lavish fresco decoration of sites like Knossos, Tiryns and Mycenae. Much of the figural or architectural sculpture of ancient Greece was painted colourfully. This aspect of Greek stonework is described as polychrome.