Color Reflection with Global Illumination in Unity 5

I'm trying to play with GI and with a simple initial setup, I''m not seeing colors reflected onto other objects.

I've read through many tutorials and searched the forums, but I'm not having any luck.

I've created a scene with 2 cubes and a sphere on top of a plane.

I added materials for each, set the shader to specular and set the specular colors - blue, green, red, and white.

I expected to see the colors of the objects floating above the plane reflected on the plane and eachother, but they don't appear to have any effect.

 

I had to set my objects to dynamic apparently.