【英语时差8,16】视觉系统，双眼视觉，和墙壁颜色（下）

 What this shows is that our visual system, in the process of giving us our impressions of the world, takes in information from all parts of our field of view. Seeing the ceiling and floor helps us to perceive correctly that we are looking at two walls painted the same color but lighted differently, not two paint chips painted different colors. Binocular vision also helps — that’s the process in which the slightly different viewpoints of our two eyes contribute to our perception of depth. Again look into a corner where two walls painted the same color meet. When you close one eye, you eliminate binocular vision; when you block your view of the ceiling and floor, you eliminate information from other parts of your visual field. As a result, you see merely two areas, one lighter¹ than the other.

1 lighter   

n.打火机，点火器；驳船；v.用驳船运送；light的比较级

参考例句：

• The portrait was touched up so as to make it lighter.这张画经过润色，色调明朗了一些。
• The lighter works off the car battery.引燃器利用汽车蓄电池打火。