Stained glass depth effect
Is this just me?

When looking at a stained glass window that covers the central focus area of your visual field, if you slightly relax your eyes, do the colors float to slightly different depths?

It only works with both eyes open, and the parallax effect works.  The depth of the colors is very consistent for me.

I also see it, for example, when I'm looking a dark window on my computer screen that has various colors of text in it (color rxvt+lynx+slashdot).

The depths seem to become less significant when my face is very close to the monitor.

Is this common? Unusual? Well-documented?
I'm slightly nearsighted (20/50,-1.25).  I don't know if that contributes at all.

Looking at slashdot in lynx right now, here's where the color depths are:
Green - in front of yellow (as in, closer to me).
Light Blue - slightly in front of yellow, behind green.
Yellow - in front of white.
White - normal.
Pink - slightly behind white.
Magenta - behind pink.
Red - behind magenta.

This doesn't seem to be in spectral order.

Actually, I just noticed that if I cover one eye, rather than closing it, I think I still slightly see the effect.
Neurological/cerebral?  Or, maybe slight synaesthesia from paying a lot of attention to a physical effect, creating a neural connection over time?

Maybe an effect of the way the optical nerve carries color subtractions rather than true color intensities? (Red-Blue, Red-Green)  This might be why red vs. green and red vs. blue are the big differences in depth..


Ex. w/ stained glass: http://www.coldspringgranite.com/royalmelrose/stained-glass-windows-holy-family.jpg  Mostly I just see the red floating behind everything else.
Ex. where I *don't* really see it, and I think that's because there *aren't* large solid patches of color: http://downeaststainedglass.com/first_baptist_oriental/bible_cross.jpg