Usually when we talk about forbidden fruit, we’re talking about cars sold in other markets that we can’t get here. This time, associate editor Scott Evans looks at another kind of forbidden fruit: concept cars that we’ll never get.

Reporting from the 2015 Frankfurt Motor Show floor, Evans begins with the radical Honda Project 2 & 4 concept. It’s essentially a go kart powered by a mid-mounted Honda race motorcycle engine, so it’s easy to see why we’d want one. Other cars include the Nissan Gripz concept and the Bugatti Vision Gran Turismo concept. Both of those preview real vehicles, but the chances of any of the more interesting details of the concepts making it to production are slim.

Watch the video below to learn more about these concepts that we can’t have.