Sent remembories, he twitted.
She blinked back the past: “up” Magnetic Hill and Indigo Girls.
Bittersweet magic; his twisted glass of road trips. (142; 23)
“The Magnetic Hill is an example of a gravity hill, a type of optical illusion created by rising and descending terrain, near Moncton, New Brunswick, Canada. When a car is placed in neutral, it will begin to roll backwards, apparently uphill. Observers will also note that water in the adjacent drainage ditches also seemingly runs ‘uphill’.” Wikipedia
To keep a level “head” a glass of water on the floor of the car reveals whether truly going up or down. Now a pay as you go tourist attraction part of a recreational theme park.
From Girl With the Weight of the World in Her Hands by the Indigo Girls (inspired by Kat’s query): “Is the glass half full or empty?”, I ask her as I fill it/She says “It doesn’t really matter, pretty soon you’re bound to spill it.”