Implements for special offerings set out for Buddhist services include incense, flowers, light, and food. The first three of these are mandatory. Some items are used during the services, like the flower baskets (keko) holding real or paper petals that are strewn about while chanting texts or circumambulating the sacred space. The shape and decorations on the implements like incense burners, vases, flower baskets, flower ornaments, candlesticks, and torch baskets changed over time, reflecting the taste of each historical period.