1.0 link Rainbow Dash Network http://rainbowdash.net/ Cerulean Spark (ceruleanspark) http://rainbowdash.net/ceruleanspark http://rainbowdash.net/notice/3926466 The steel pipe is a stand-in for a lava tube— the conduits that form within large lava flows as the outer skin solidifies. The banana is a stand-in for a banana.