00:00 Introduction from Jammu
02:00 Nilsson begins speaking; description of the first three optical devices
03:30 Description of the Greeks discovery of the first form of optical device
05:30 Description of the Romans and the second optical device
09:00 Discussion of the third image forming device, discovery in the 15th century
15:00 Discussion of Nilsson's discovery of a fourth optical device
21:30 Question regarding the impact of reflection surfaces
23:00 Question regarding the difference between Nilsson's device and mirrors
26:00 Discussion of pinhole lenses and pinhead mirrors
32:00 Discussion of the impact of pinhole size
38:00 Discussion of Nilsson's creation of an actual pinhead mirror
41:00 Discussion of the implications of a pinhead mirror
44:00 Question regarding the difference between a concave mirror and a pinhead mirror
45:30 Discussion of pinhead mirrors and eclipses
46:00 Question of reflectivity; end of seminar
