A good metaphor for the subjectivity of data is photography. Both involve devices with explicit politics, interpretation, and the subjective 'eye' of the creator. To wit, here's a list of Ansel Adams quotes, replacing photography/photographs with data collection/visualisation.
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To avoid confusion out of the context of your tweet you should replace 'Ansel Adams' with a parody name like Ansel Datadams or something. I had to do a double take before I noticed your replacement note.

