As we all know, the elevator is a vertical vehicle that we use very frequently for going home, going to work, going to school and so on.Almost every tall building has an elevator.But the elevator buttons stay the same color all year around.After pressing the elevator buttons, passengers have no idea how many people have touched it, or how many bacteria are attached to it.This must be taken seriously under the context of the COVID-19 epidemic, which is highly exposed to transmission.So, we combine the elevator button light with the gradient light.Visualize the number of times the button is touched, by changing the color gradually. In order to remind people to wash their hands.Not only reminds passengers,but also reminds the elevator cleaning staff：The red light is flashing! It's time to sanitize and clean the entire elevator. (电梯按钮的颜色常年保持一致，我们永远不知道它被多少人触碰过，也无法想象上面积累了多少细菌。但“看不见”不应该成为我们不洗手的理由。对于接触传播风险极高的新冠肺炎疫情来说，这点必须受到人们的重视。因此我们将电梯按钮与渐变灯结合，利用颜色的过渡变化将按钮被触摸次数可视化，形成#亮灯警告#，以提醒人们去洗手。)