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Mounting the metalens on a tripod with a color filter and camera sensor, Park and the team took to the roof of Harvard's Science Center.

My vision and wrist size aren’t things I can control, but it’s almost comical how much of a difference high-contrast fonts and adding a color filter made.

The Nova Air C is equipped with E Ink’s Kaleido Plus screen, which uses a color filter layer on top of a more typical E Ink panel to offer 4,096 colors.

It relies on a traditional black and white E Ink display with a color filter laid over the top possessing red, green, and blue pigments.

Instead of the more paper-like white of black and white E Ink, Kaleido is this... muddy greenish gray thanks to that color filter.