frustrating – adj. causing feelings of annoyance or anger

invert – v. to change the position, order, or relationship of things so that they are the opposite of what they had been

positive – adj. explicitly stated or expressed

negative – adj. expressing denial or refusal

feature – n. an interesting or important part, quality or ability

mileage – n. the average number of miles a vehicle will travel on a gallon of gasoline

mural – n. a usually large painting that is done directly on the surface of a wall