In high school we all hated it, but the older we get, the more we may realize that beside many practical applications, the reasoning styles one trains in mathematics are fundamental to the capacity for abstract thought. For that reason it may be useful (and fun?) to get into mathematics again. And not just the linguistic theories behind it: no, real formulas and equations.
I presume it may be somewhat difficult to organize this course, as the field of mathematics is far from unified, and it asks for a different format than the more text-oriented seminars. I'm not sure what format would be the best... In any case, it might be interesting to address set theory and fractal theory, and perhaps something about the different geometries. I'm not sure, I'm open for anything - first, I'd just like to know if people are interested in a course like this.