Poi artists may also sing or dance while swinging their poi. Occasionally, smaller tassels called poi piu were affixed to the base of the poi ball. The famous Hawaiian staple poi is made by mashing steamed taro roots with water. The use of glowsticks and illuminated poi are popular once the lights are dimmed. Modern poi coexists with traditional Maori poi and enjoys a broader, worldwide audience. GPS applications typically use icons to represent different categories of POI on a map graphically. Poi feature in the 1980s hit song "Poi E". By ancient Hawaiian custom, fighting is not allowed when a bowl of "poi" is "open". Some performance poi also incorporate tails or streamers for visual effect. The Apache POI opensource project provides Java libraries for reading and writing Excel spreadsheet files. Geocaching applications are built around POI collections. Other saagas that are eaten are pita gahama, khada, poi, koshala, sajana etc. The resulting "breadfruit poi" is called . Pushpin is another iOS app that lets you add POI on the go. There is no fighting when eating from a bowl of poi.