This week at inchybyinch the inspiration letter of the alphabet is 'x'. This brought back not-so happy memories of maths lessons with Mr Griffiths in the 1970's, in my Secondary Modern, subsequently Comprehensive, School. A large overbearing man, Mr Griffiths ate chalk at the front of the classroom and threw the board rubber (in those days made of solid hardwood) and/or spitty chalk at any poor soul who failed to understand the maths lesson of that day, shouting his disgust at your existence. Very often, of course, this was me. The image of the maths teacher on this inchy reminded me of Mr Griffiths, and the x=y stuff remains as incomprehensible to me today as it did then. I seem to have got by without it.