Ad agency Dentsu London create a card with a self-contained circuit that reacts when pressed.

Dentsu London has been making Christmas cards for the festive season inspired by the University of Illinois’ experiments with making silver conductive ink. The advertising agency used a conductive ink pen, a watch battery and surface-mounted electronic components to create a self-contained circuit on the card. Lights appear on the Christmas tree when you press the circles at the bottom of the design.

Check out the video below that shows the team creating the Christmas cards and people’s reactions when they try them out:

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