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Compass?  Introducing a geometrical instrument with 3 basic
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Triangles in the Middle   Natural Shapes  Stage: 4 Challenge
Level: Challenge Level:1   Certain biological creations exhibit
a striking regularly repeating structure - either 3-dimensional
or planar. Here are some pictures of interesting biological
structures:  Can you see any regularly repeating structural
elements in these images? Classify them as fully as you can.
Can you identify what each image represents? How does its
structure enable it to perform its function?  Can you group
these structural forms into categories? Can you think of other
examples of natural objects which show the structural
characteristics common to the members of each group?       Notes
and background      Working out how molecules pack together can
give important insights into their properties. There are many
different possibilities. DNA wraps toget