This month’s cover feature showcases a colourful discovery from Roman London: vibrant fragments from one of the largest collections of painted wall plaster of this period ever found in the capital. Once part of fashionable frescos, thousands of pieces of plaster had been dumped in a pit associated with the demolition of a high-status building that stood in Southwark almost 2,000 years ago. Now, work is ongoing to piece this ancient jigsaw puzzle back together, revealing fascinating insight