By linearly I think he means the man on the bike goes in a straight line down the hill but still ends up back at home.
When he leaves the house he rides downhill past a welder, a guy fixing a van, the corner with kids playing basketball, people by a car then he stops at the store. He gets his beer, hops on his bike, and continues in the same direction. Again, he rides downhill and passes in reverse order, the kids playing basketball, the people by the car, the welder and van fixer and arrives at the house from the opposite direction he left.