This environment lets you explore two different forms of spiral, Archimedean and logarithmic.[br][br]For each choice of base, look carefully at the points at which the spiral crosses the axis.[br][br]Now try this when you dilate the spiral.[br][br]Explain the difference between the two spirals.[br][br]Can you figure out why the logarithmic spiral is called that?[br][br]There are sea animals that grow in the form of logarithmic spirals. Can you suggest a reason why this might be the case?