这是一个著名的视错觉图:名叫“贝汉转盘(Benham's top)”,这个转盘只有黑白两色,但它在旋转时,人会看到其它颜色,而且每人看到的颜色各有不同。你看到的会是什么色呢?When the disk is spun, arcs of pale color, called Fechner colors or pattern-induced flicker colors (PIFCs), are visible at different places on the disk. Not everyone sees the same colors.