once rejected but recently revived, suggests that this is only true of the rim of the vessels and the cutting of the fixed cage, but not for the joining of beaker and its cage; these would have been made separately and fused when hot. For example, it is claimed that the smooth joins on the Munich cup show the fusion of the cage to the main cup, though the cage itself is carved. These smooth joins also show the Cologne and Pljevlja cups above. However this remains controversial, and a fragmentary cup found in Corinth in the 1960s is said to show no evidence of joints where the cage meets the main cup when examined under a microscope. Apart from carved gems, a small fragment of an openwork pattern in reticulated silver has survived in a large hoard of Roman silver chopped up in the 5th century as bullion, and buried in Scotland at Traprain Law, now in the Royal Museum of Scotland. The fragment shows a pattern based on circles, that is very similar to the glass diatreta, suggesting that the same style may have been used in silver plate, though which came first is unknown. Some examples add difficulty to the manufacturing process by using different colours on the cage, like the Milan and Cologne cups, but most are plain glass, like those at Munich and Corning. For the special technology of dichroic glass, which changes colour when light passes through it, see the article on the best example, the Lycurgus Cup. Function The function of cage cups is debated. The inscriptions strongly suggest that they were cups to be used, and perhaps passed around, for ceremonial drinking at feasts, but it has been suggested that the shape of the out-turned rim of the beakers and the missing stand of all known vessels means that all diatreta were like the example in the Corning Museum of Glass, which was almost certainly an oil lamp designed to be suspended. The Corning cup was certainly intended for suspension, as the copper alloy fittings were found with it; there is a round band fitting under the rim, and three pieces that are part chain and part rod, leading to a ring and single rod, and a variety of cups for three attachments, very like a hanging basket in modern gardens, and an arrangement known to have been used for lamps by