Numerous subtle variations are possible in each of these categories.

I've been there many times, but until then had never noticed the number of towers and the subtle variations between each one.

In cases where there is a subtle variation between important aspects, this can be problematic.

She had wanted to do this to Rachel's hair, to add a subtle variation in color.

This strike is made only with a subtle variation on the basic men technique.

There were some subtle variations - many of them existing only in my own imagination, I'm sure.

This process repeated itself, with subtle variations, on several levels.

In an advanced book, there could be a subtle variation.

The emotions can be combined in many ways to create more subtle variations of emotional experience.

Other, more subtle, variations are also known, such as changes to the development of the setae.