Colorfil Filter

A color changing Colorfil filter indicates when it's time to change it. All sorts of natural objects like fruits and flowers change color at different times. Why don’t more of our technologies?

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IV. Technology should communicate, but it doesn’t need to speak.

Simple icons and color indicators work to communicate most information needs.

If voice is necessary, create responsive but not proactive interaction patterns to ensure the user is in control of when they engage.