Whereas art historians will dilate on the symbolism of capturing the visual world in the convex mirror prominently displayed on the rear wall, I will be concerned instead with its optical properties, such as its focal length and light-gathering power.

• 艺术史学者会注意后面墙上那面醒目的凸面镜，对它捕捉了视觉世界的象徵意义加以热烈讨论，而我则会专注于它的光学特性，如焦距与聚光能力。