To understand them, the viewer must achieve dual representation: he or she must mentally represent the object as well as the relation between it and what it stands for.

• 观看者看见它们，必须在心里形成双重再现，才能了解它们：一方面，见山是山，就是把图像当图像；另一方面，见山不是山，就是当它们指涉的是关系（图像与实物间的关系）。