That would be great, thanks. Actually, marzipane potatoes are little marzipane balls, nearly spherically. They only change shape if you squeeze them, since marzipane is quite soft as wax. But for this purpose you may very well assume they are spheres with no height change. That's why I got the idea, when I saw your little planets. I found a photo in the german Wikipedia. Here's the link to the article: https://de.wikipedia.org/wiki/Marzipankartoffel