Given the surviving records for all manner of other optical systems and mechanical drawing aids, the absence of evidence for the Hockney projector is difficult to explain.
英
美
- 其他光学系统与绘图辅助工具的记录,到今天都还留存了不少,为何唯独缺乏霍克尼投影设备的证据,显然很难解释。