This activity is a technologically updated version of the classic challenge to replicate an irregular block structure without seeing it, only hearing a careful description of it. Using e-mail and other means of communication, the activity can become a whole-class rather than individual competition.

This activity is a technologically updated version of the classic challenge to replicate an irregular block structure without seeing it, only hearing a careful description of it. Using e-mail and other means of communication, the activity can become a whole-class rather than individual competition. Internet extensions and suggestions for assessment are included. (author/sw)