horse of a different color

Something completely different or separate, especially in comparison to something else. I've always found math to be easy, but calculus is a horse of a different color.

Common Names:

Name	Pronounced	Usage
Clytia	-	Greek Mythology (Latinized)
Weston	['westən]
Britt	-	Swedish, Norwegian, Danish
Jeanine	zha-NEEN (French), jə-NEEN (English)	French, English, Dutch
Pascal	pas-KAHL (French), pahs-KAHL (Dutch)	French, German, Dutch
ØRjan	UUR-yahn	Norwegian