During the protest against the closure of the Health Contact Center, a bus stop mysteriously displays a message in Nordic (is it Norwegian?).

In photographing it, I noticed that I had to control the shutter speed manually.

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Is it possible to figure out the frequency of the lights from this?

An interesting skill would be to time your own saccades, and to count the number of flashes you see in between. Maybe I could pick this up with a couple of hours' training.