1. A Sketchbook of Symmetry

2. SYMMETRY A Definition? Symmetry OPERATIONS Symmetry Elements
Reflection
Rotation
Others
Symmetry Elements
Mirror (plane)
Rotation axis

3. SYMMETRY ELEMENTS MIRRORS planes (lines in 2d) cuts object in half
halves are mirror images
Shown as a dotted line

4. SYMMETRY ELEMENTS MIRRORS planes (lines in 2d) cuts object in half
halves are mirror images
Shown as a dotted line

5. Questions to ask: Reflective symmetry? Where? Draw mirror(s).
Rotational Symmetry?
Where is axis?
What fold is axis?
Draw axis.

6. LILY

7. HIBISCUS

11. PLUMERIA

12. Orchid

13. Tulip

14. SNOWFLAKES Wilson “Snowflake” Bentley Vermont farmer
His work is world-famous.
photographing individual snowflakes.
First photograph
Over 5000 photographs
“No two alike”

15. SNOWFLAKES

16. 2 More Examples of Snowflakes from Bentley’s Photographs

17. From another source... Another site:

20. Growth of a snowflake… (approx. time was 5 minutes)

21. Some Further Links to Explore:
Symmetry of Border Patterns
Symmetry of Inorganic Molecules

26. Field Patterns

28. END

29. Symmetry References Symmetry of Inorganic Molecules Snowflake Bentley
Great South Catalog
Other Snowflakes