Particular 点 destinies, leaving long fading paths behind them, 円 around a tube's circumference on a voyage of 発見. The チューブ, which will take you either up or down in dimensionless 空間/宇宙, opens its potential doors to show that what's inside might be the same as what's outside... i.e. that perhaps this チューブ view is neither 表面 nor volume, just an afterdeath narrative element.