one of my other passions is knitting.. you can learn some basics if you read the essay "hex and bin, meet my friends, knit and purl" (google it, lots of people have links to it.

knitting is binary made visible.
(the site Woollythougts over in the UK is another that has many idea's about knittings binary nature... they also have knit fractals and other cool math stuff.
(i have knit moebius scarves (a single edge) and Kleinbottle hats (for my math geek son))

but this doesn't have much to do with grammer does it?

my other obsession