Before setting out, Chen always draws a "mental map." When walking she has to pay close attention to traffic sounds (when the sounds of cars and those of walking feet are moving in the same direction, then the light must be green), and they have to be careful of signs along the side of the road.
出發前，她會先在心中描繪一張「心理地圖」，走路時細聽車流聲音（如果車聲和人潮流動的聲音呈「平行」，就表示現在是綠燈）、留意路邊易於辨識的標的，透過理髮店、麵包店的味道，尋找「走到哪裡了？」