There's a form here to make life easy for you, but if you or your browser would rather not cope with that, please address email to: cartoons@beholder.co.uk
Don't even think about asking for help on any of the Planetarium puzzles. I won't talk about them (except in the xiii Forum) and before you start digging around there's nothing about them anywhere else on this site. Not even hidden in the source. Trust me.