I'm not sure what the slogan has to do with rationality, though I'd like a good slogan which told people to think about how much of something is good or bad, how good or bad it is at various quantities, and for whom. And while I'm wishing for a rocketship and a pony, I might as well include something about checking on whether your predictions match your theories.
Is lead at all good for people at any dose?
I agree that the shirt design has too many fonts and colors. When you first linked to the design, I despaired. I didn't want to do a tutorial.
At this point, have a partial memory-- an adage about not using more than 2 font families (it might have been 3) on a page unless you have a degree in design.
Thank you for that feedback, really helpful stuff about design! I will take that to our designer, and keep that in mind myself. For a bit of meta about myself - I don't have a good visual sense at all, so I am acting as a go-between for what Less Wrongers express as important and our designers.
For the slogan, it was expressed by a number of Less Wrongers here as something they associate with rationality, which is why we worked on it.
Happy to share that, after multiple rounds of feedback, here is the set of rationality-themed T-shirts and bags with the slogan that got most support from the community, "The Difference Between Medicine and Poison is Dosage."
These t-shirts and bags are an effort to update based on the feedback received on the original set of rationality shirts and optimizing suggestions. This includes use of graphic images in the words, use of more professional designers, etc. We went back to the drawing board, and tried to design a new shirt that used a slogan that was quite popular. We ran the design by the Less Wrong FB group a couple of times (1, 2) and this is the final product.
As you can see, there are two styles available, one with "Dosage" empty and with the image of the dropper, and one with "Dosage" filled in and without the dropper. Various colors, sizes, and materials are available for each shirt/bag.
The first style is available for purchase on CafePress here.
The second style is available for purchase on CafePress here.
Look forward to hearing about your experience and thoughts about these t-shirts and bags, and the impact they make in carrying good rationality-themed memes into the world! We will be making more shirts and running them by the community as we did with these. All revenue will go into promoting rational thinking strategies to a broad audience.