What's the antonym of "fifty-thousand foot view"?

I'm writing about a concept that I would like to explain at three levels: high-level, medium, and very granular.

"Fifty-thousand foot view" is a common business idiom to describe the highest, most general level. (I've also heard 10K and 30K feet.)

But, what's the comparable phrase for the medium and lowest-levels of explanation?

Solution 1:

I've heard

at the detail level

at the microscopic view

down in the trenches

Solution 2:

There are also the complementary "Bird's eye view" and "Worm's eye view", but these may be more specific to artistic and technical projections rather than business-speak.