To See or Not to See contains various interesting topics about lighting. Some of them are almost entirely technical in nature while others are mixed with some philosophy or history and a dash of humour. To See or Not to See can be considered as a log of a journey into the fascinating world of light and lighting. This is why it doesn't have the logical layout that you can find in other books on this subject. Basically, it's a collection of essays on various issues of interest or fascination the author has encountered during that still continuing journey, essays such as psycho-optics, light source failing behaviour, beyond the Purkinje-effect and a tribute to the revealing power. Therefore, the author would like to invite you to accompany him on this fascinating journey.