<P> Paper became available in the last centuries of the period, but was also extremely expensive by today's standards; woodcuts sold to ordinary pilgrims at shrines were often matchbook size or smaller . Modern dendrochronology has revealed that most of the oak for panels used in Early Netherlandish painting of the 15th century was felled in the Vistula basin in Poland, from where it was shipped down the river and across the Baltic and North Seas to Flemish ports, before being seasoned for several years . </P> <P> Art in the Middle Ages is a broad subject and art historians traditionally divide it in several large - scale phases, styles or periods . The period of the Middle Ages neither begins nor ends neatly at any particular date, nor at the same time in all regions, and the same is true for the major phases of art within the period . The major phases are covered in the following sections . </P> <P> Early Christian art, more generally described as Late Antique art, covers the period from about 200 (before which no distinct Christian art survives), until the onset of a fully Byzantine style in about 500 . There continue to be different views as to when the medieval period begins during this time, both in terms of general history and specifically art history, but it is most often placed late in the period . In the course of the 4th century Christianity went from being a persecuted popular sect to the official religion of the Empire, adapting existing Roman styles and often iconography, from both popular and Imperial art . From the start of the period the main survivals of Christian art are the tomb - paintings in popular styles of the catacombs of Rome, but by the end there were a number of lavish mosaics in churches built under Imperial patronage . </P> <P> Over this period imperial Late Roman art went through a strikingly "baroque" phase, and then largely abandoned classical style and Greek realism in favour of a more mystical and hieratic style--a process that was well underway before Christianity became a major influence on imperial art . Influences from Eastern parts of the Empire--Egypt, Syria and beyond, and also a robust "Italic" vernacular tradition, contributed to this process . Figures are mostly seen frontally staring out at the viewer, where classical art tended to show a profile view - the change was eventually seen even on coins . The individuality of portraits, a great strength of Roman art, declines sharply, and the anatomy and drapery of figures is shown with much less realism . The models from which medieval Northern Europe in particular formed its idea of "Roman" style were nearly all portable Late Antique works, and the Late Antique carved sarcophagi found all over the former Roman Empire; the determination to find earlier "purer" classical models, was a key element in the art all'antica of the Renaissance . </P>

During the middle ages most art music and architecture were intended for the purpose of