Working on this mark I wanted to try a subtle drop shadow under the negative-space "tick". Unfortunately the tick is not an object. It was and object, but I have already subtracted it from the "box" behind it.
Below you can see the effect of an inner glow effect on the lower half of the box. It almost works, but of course applies the effect all the way around.
Can anyone think of a way of getting a drop shadow under a non-existent object, or do I need to backtrack to keep that tick shape.
Risking a double question, if I do need the tick object in order to apply a drop shadow to it, is there a fast way to turn that negative space I have now back into the object?