With its circle formed of three green arrows, the Möbius strip has been the
universal logo of recyclable materials (but not necessarily recycled materials)
It owes its name to the mathematician August Ferdinand Möbius, who in 1858
was the first to describe a two-dimensional object with a single face. The
schematic version was chosen as the symbol of recycling on the first Earth Day,
an event created by Wisconsin senator Gaylord Nelson to raise global awareness
of the environmental cause.