Regarding zenpusher: From my armchair, It seems like you should make the contrast higher for the fonts. I've been reading Thinking, Fast and Slow, and his research shows that text that is hard to read activates the conscious part of our brain, and makes it harder to get messages into the subconscious.
Actually, what happens isn't much different than a magician's slight of hand. The eyes are drawn to the underlying image, thereby suspending the critical faculties of the mind and creating an opportunity for implicit learning.
Thinking Fast and Slow is one of my favorite books. Read it twice!
