More things I made.

The greek letter ε or epsilon is used in mathematics to represent a small real (or real small) number. To be more precise, an arbitrarily small positive real number, most famously used in the δ-ε definition of a limit, which you probably hated in calculus class. This designe commemorates the diversity of ways that ε has been written throughout history. I wanted the last line to be printed on the back but RedBubble doesn't support that (yet?):

I think the tote bag also looks good.