I have but one slight criticism. In the section titled 'Mirror Images' a rather sudden jump to notation of the image and its invariants is made without defining what the terms meant in $l^2 m^2-2l^2-l^4$. This did rather stop my education in knots for the moment. However, links with other sites did allow me to continue to peruse knots to a greater depth. I would have liked a little more about the theory of colouring than was provided by the site, but here again to quote the designers; 'We are not interested in conveying technique '. This would seem to agree with their stated aim of 'suggesting that the making of mathematics is a natural human activity, part and parcel of the usual methods by which man has explored, discovered and understood the world'. In this last aim, I think the designers have most definitely succeeded.