An air conditioner is provided. The air conditioner may include an input device that receives an input for setting an operation requirement, a fan that blows air according to the set operation requirement, an illumination system that illuminates a closed curve region, a case having the fan provided therein and at least one air outlet formed therein for discharging air outward from the closed curve, and a lighting controller that controls the illumination system to generate an indicator of a flow direction of air being discharged through the at least one air outlet.