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Wedding cake contains edible chocolate batteries that power candles

Unveiled at Expo 2025 in Osaka, Japan, the cake is topped with gummy bears that move thanks to a pneumatic system

23 April 2025

Robotics meets the culinary arts A Swiss Italian team has created RoboCake, a robotic wedding cake that showcases the advances in robotic food research. The project was unveiled today at the Expo 2025 in Osaka. — Jamani Caillet/EPFL

This isn’t your normal wedding cake. The gummy bears on top can dance, their heads and arms moving thanks to injections of air through a pneumatic system, and the LED candles at the bottom are powered by batteries made out of chocolate. Such edible electronics have been proposed as a solution to electronic waste. The cake was unveiled at Expo 2025 in Osaka, Japan, on 13 April.

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