If you have been to Let Me Try or Penta Problems sections already, you will have noticed that rectangles and squares abound this month. Rectangles and squares have a great deal in common, and they are both member shapes of the quadrilateral family.
Some people do.
But it can be very confusing. Well, at least not too good for your maths vocabulary. Spirals Spirals are all around you. They are a complex and fascinating shape and their variety is amazing. Jodeen Stephonson's fractals Ned May has used Fibonacci spirals to produce some fascinating art.