The question of the "Coming of the Greeks" to Greece is a classic issue in European protohistorical archaeology. It may be regarded as one of the byproducts of the "Indo-European problem", which is concerned with determining whether the resemblance and correspondence between some of the languages spoken in Europe and Asia. The Greek Neolithic originated from the Middle East, either by way of mass migration or through influences or infiltrations. The Greek Bronze Age is divided into three main periods, as is often the case in archaeology on account of some inexplicable fascination with the number three. One, therefore, distinguishes between an Early Bronze Age, a Middle Bronze Age and finally a Late Bronze Age, the latter corresponding to the Mycenaean period. Archaeological legibility issues have also been postulated, such as burial styles becoming "invisible" and building styles based solely on earth and wood, even though cultural continuity prevails throughout Bronze age.