【英语时差8,16】视觉系统，双眼视觉，和墙壁颜色（上）

This is a psychology-of-perception demonstration¹ you can experience in a room whose walls are all painted the same color. Look into a corner of the room, where two walls and the ceiling meet. Almost certainly one wall will be receiving more light than the other from some source, so one wall will look lighter² than the other. Yet, somehow, your visual perceptual system correctly tells you that you are seeing two walls, painted the same color, meeting at a corner. Now close one eye and hold up pieces of cardboard so as to block out the ceiling and the floor, restricting your view to the two walls and the corner where they meet. The scene will then look dramatically different. You’ll see two flat-looking areas of color meeting at an edge, like two paint sample chips butted³ against one another. The impression of two walls meeting at a corner will be gone.

1 demonstration   

n.表明，示范，论证，示威

参考例句：

• His new book is a demonstration of his patriotism.他写的新书是他的爱国精神的证明。
• He gave a demonstration of the new technique then and there.他当场表演了这种新的操作方法。

2 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。

3 butted   

对接的

参考例句：

• Two goats butted each other. 两只山羊用角顶架。
• He butted against a tree in the dark. 他黑暗中撞上了一棵树。