I don't think this can be accurately tested until there's some provision for explicitly explaining what the lightbulb means and does (this could be a tooltip of some sort on hover as well as a bold simple explanation when someone is first learning how to use the site). The problem with the lightbulb is that it represents an action that people rarely need to conceptualize, so it's nearly impossible to symbolize it in an intuitive way without that little hump of a learning curve. An "X" is a very common symbol that represents an action that people use all the time and intuitively means /delete/ when in the context of a list of content and /close/ in the context of a UI element like a window or a modal dialogue.

Joshua Bronson wrote:
Yesterday Julia and I went over the Melkjug demo we'll be giving to CMU students on Thursday. It turns out I'm not the only one without enough imagination for the click-the-lighbulb-to-close metaphor to make immediate sense. I suppose that brings us up to $0.04 in the lets-just-stick-to-the-good-old-fashioned-tried-and-true-x pot?

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