One well-known hologram of that era captured in red laser light a chessboard on which pieces could be viewed from various angles as a viewer shifted position.
一幅当时著名的全息图，是用红色激光拍摄的一个棋盘，当观察者移动位置时，可以从不同的视角观察棋盘上的棋子。
A cone shaped area is an easy way to pick anything that a viewer can see.
而锥形的区域更易于选中观察者能够看到的任何东西。
The idea is to make the viewer rethink his or her original ideal.
这个想法是使观察者重新思考他或她原来的设想。
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