As with many towns in the Empire, the colonia shrunk in size in the 4th century but continued to function as an important town. Although houses tended to shrink in size, with 75% of the large townhouses being replaced by smaller buildings by c. 350, in the period 275 to 325 a weak "building boom" (the "Constantinian renaissance") occurred in the town, with new houses being built and old ones reshaped. Many of the towns mosaics date from this period, including the famous Lion Walk mosaic. Late Roman robber trenches have been found at some sites for removing and salvaging tessalated floors and tiles for reuse in later houses. The pottery industry in the town had declined significantly by 300, but the 4th century did see an increase in the bone-working industry for making furniture and jewellery, and evidence of blown glass making has also been found. Large areas of the Southern part of the town were given over to agriculture.