Identify the best product based on its user interface, considering the principles of affordances

In our daily lives, we interact with a number of electronic and digital systems in our homes, cars, shopping centers, self-checkouts, or even in McDonalds (using the self-order kiosks). We also interact daily with computer programs and browse websites. Based on your experience, identify the best product (e.g. a system, software, an application or a website but NOT a mobile app) based on its user interface, considering the principles of affordances/signifiers, feedback, constraints, mapping, and consistency.

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