I rather like drawing fruit (almost as much as I like eating it) with its pleasing contours, texture and shading. It's best in colour, of course, as this allows you to truly capture the subtle variations which are the mark of real life but even in black and white a decent representation is possible. With this in mind I plucked a pair of similarly sized objects from the fruit bowl and arranged them like this:
However while I've been practising my shading recently I felt like a change was in order today. Hence I began looking for the key contours which defined the structure of the apple and pear and then tried to capture them. Looking closely the most important features are the two ends, stalk and blossom, where the body of the fruit curves in. If these are rendered accurately then the rest of the body just kind of follows:
Comparing my picture with how the fruit actually looked I'm quite taken by the similarities in overall shape and balance between the apple and pear. Even without colour and shading the objects clearly telegraph what they are and how they fill space. I'm not quite sure how I might use this information to put together a more complete study of such an arrangement but at least the potential is there I think.