Coworker of mine is offering me a chance at his apple collection before it goes to fleabay. I picked what I could get away with storing at my house with consulting the spouse, but there's one more thing I want. He has the Picasso apple lamp, but it's missing the base with the actual light in it, so just the etched pane of glass. I told him it was somewhat worthless without the base, but he seems to disagree. I looked through completed auctions online, and only found one for $1600, but it was the whole lamp. Any idea what just the glass could be worth?