bull (and its horns of consecration), the labrys (double-headed axe), the pillar, the serpent, the sun-disc, the tree, and even the Ankh. Haralampos V. Harissis and Anastasios V. Harissis posit a different interpretation of these symbols, saying that they were based on apiculture rather than religion. A major festival was exemplified in bull-leaping, represented in the frescoes of Knossos and inscribed in miniature seals. Burial practices Similar to other Bronze Age archaeological finds, burial remains constitute much of the material and archaeological evidence for the period. By the end of the Second Palace Period, Minoan burial was dominated by two forms: circular tombs (tholoi) in southern Crete and house tombs in the north and the east. However, much Minoan mortuary practice does not conform to this pattern. Burial was more popular than cremation. Individual burial was the rule, except for the Chrysolakkos complex in Malia. Here, a number of buildings form a complex in the center of Mallia's burial area and may have been the focus for burial rituals or a crypt for a notable family. Evidence of possible human sacrifice by the Minoans has been found at three sites: at Anemospilia, in a MMII building near Mt. Juktas considered a temple; an EMII sanctuary complex at Fournou Korifi in south-central Crete, and in an LMIB building known as the North House in Knossos. Architecture Minoan cities were connected by narrow roads paved with blocks cut with bronze saws. Streets were drained, and water and sewage facilities were available to the upper class through clay pipes. Minoan buildings often had flat, tiled roofs; plaster, wood or flagstone floors, and stood two to three stories high. Lower walls were typically constructed of stone and rubble, and the upper walls of mudbrick. Ceiling timbers held up the roofs. Construction materials for villas and palaces varied, and included sandstone, gypsum and limestone. Building techniques also varied, with some palaces using ashlar masonry and others roughly-hewn, megalithic blocks. In north-central Crete blue-greenschist was used as to pave floors of streets and courtyards between 1650 and 1600BC. These rocks were likely quarried in Agia Pelagia on the north coast of central Crete. Palaces The handful of very large structures for which Evans' term of palaces (anaktora) is still used are the best-known Minoan building types excavated on Crete; at least five have now been excavated, though that at Knossos was much larger than the others,