I originally wrote this and printed it on green paper. In the time it took a person to read it, they would have been staring at the green paper for about 1 minute.
In that time the cones in your eyes that allow you to see color would have grown used to viewing the green color. If immediately after reading this one was to stare at a white piece of paper, it would ‘glow’ red. Sadly, viewing this on a monitor does not work. Sigh.