Hatch marks

What's up with those hatch marks? Is my sphere just too dark? Should I pick light grey instead of almost black? I dunno.

I've picked three variables to change and see when the hatch marks show up:

1. Are the refracted rays rendered?
2. Is the diffuse component rendered?
3. Are the reflected rays rendered?

Image	Refract	Diffuse	Reflection	Hatching
	no	no	no	no
	yes	no	no	yes
	no	yes	no	no
	yes	yes	no	yes
	no	no	yes	no
	yes	no	yes	yes
	no	yes	yes	no
	yes	yes	yes	yes

Only when refraction is enabled do we see the hatch marks. This narrows it down to the following:

1. Specular highlights
2. Direction of refracted ray
3. Fresnel term
4. Tone mapping
5. And probably about 10 other things

Things that did not remove the hatch marks:
Removing tone mapping
Removing specular highlights

Removing the specular highlight does not remove the hatch marks. I'm not going to bother posting a pic. It looks like the sphere with everything enabled, just no specular highlight.