1The anthropologist spent years as an observer in the remote village, taking meticulous notes on the local customs and traditions.
2Can a truly objective observer exist, or is all observation filtered through the lens of personal experience and bias?
3As an observer at the international conference, she was struck by the stark differences in approach between the various delegations.
4In the context of quantum mechanics, the act of observation itself can alter the behaviour of subatomic particles, raising questions about the role of the observer in shaping reality.
5There is a long tradition of philosophical debate about the nature of observation and the relationship between the observer and the observed, from Plato's Allegory of the Cave to modern phenomenology.