Glass
Clear, smooth glass produced by smelting Beach Sand at the high temperatures achievable in Pokopia's mid-game processing facilities. Glass is the island's transparency material: it appears wherever a window, lens, lamp globe, or reflective surface is required, and its presence in a recipe immediately signals that the item being built has a visual sophistication that raw or semi-processed materials cannot provide. Mirrors, illuminated signs, and the glazed panels of outdoor structures all depend on it.
Unlike most Pokopia materials, Glass cannot be gathered directly from the environment — it must be manufactured from Beach Sand, which is abundant, through a processing step that requires both infrastructure and time. This manufactured quality makes Glass a reliable metric of island development: a player who is regularly producing and using Glass has moved meaningfully beyond the gathering-and-placing loop that defines the early game. The Hatch Window, Glass items, and Mirror recipes are its signature applications.