Speaker imaging

I agree with the guy above.

Also I just happened to try this the other day. Except I closed my eyes first, and then took off my glasses. Sounded exactly the same. So the sound wasn't changing. Taking them off while still open blurs everything visually, doesn't change the sound at all, but does seem to allow the brain to believe more that it is closer to really being there.

I suggest not wearing any clothes

Another issue is the nose...it's rarely mentioned that some sound goes up your nose while listening and there has been very little research about where that sound ends up. Trapped in the sinus cavities? Does the lower midrange battle with the nose hairs? Can you recover the sound lost to the nostrils? Try listening with and without a large moustache, or simply stick earplugs in your nose when seriously listening to see what I mean...it is an issue requiring further research.

Plastic Surgery may be in order for the TRUE audiophile.

Look good, hear great.....

When the women start flocking around though, to hell with this silly hobby!

Other factors changing the sound, for me, include

Getting a haircut, placing a different piece of furniture in the sweet spot,
vacuuming the carpet before a listening session, treating (wiping) the walls
with anti-static spray.