Like the word "farther" which denotes a physical advancement of distance, "further" simply denotes advancement to a greater degree. Often confused with "farther" by those who weren't paying attantion in 8th grade grammar.
Steve is being a doofis, and if he takes this issue any further I will open a can of whopass on him.
The bus in which Ken Kesey and his Merry Band of Pranksters rode across America in, in the 60's. It was covered in day-glo paint, and they pranksters would do LSD in it. It is talked about in Tom Wolfe's The Electric Kool-Aide Acid Test.
Ken Kesey's Bus Further was covered in day-glo. You were either on the bus, or off it.