Apples and oranges...
There's plenty of similarity. You can compare them quite easily; apples and oranges. It's not like you're trying to compare a skyscraper and a cow. That would be rather difficult. But fruit? Simplicity.

Apples are harder, but with a thin skin. You can break through them easily to tear them apart. Oranges are a bit difficult; tough skin, but nothing but juice and stringy softness inside. Oranges will bounce higher when you drop them. Apple seeds are small and dark, with a silky shell around chewy whiteness. Supposedly they're poisonous; locked within a tough core, most people find them too isolated to bother with. Orange seeds, on the other hand, are loud and large and pale, invading the ruit in a random manner. You could try to bite down on them, but they won't break easily; in texture they are rough and striated, but still they're shape is streamlined enough to slip down an unususpecting eater's throat.

Certainly, they are very different. But they aren't radical differences (the cow's black and white blotches, in comparison to the skyscraper's cool gray, black, and mirror tones- it doesn't work), differences that mean nothing. They contrast. Thin skinned and hard, tough but juicy. Either would do to refresh a weary worker at the end of the day; crisp, sweet, tangy- you could describe either fruit with those words. So why does everyone act as though the two are as incompatible as that poor cow on top of the skyscraper?

They aren't that different. So maybe, one day, an orange will decide that it's tired of being unjustly segregated; maybe someday it will find a place in that bowl of apples on the table. Until then, it's just going to sit here and sulk.