Homework Discussion

• Read pages 383 – 388

• Page 394: 7, 21 – 24, 27 – 29, 35-45, 47,

36. A

BC

C

AB

A

BC

A

BC

38

23.

28.

A B

CD

E

A’ B’

C’

D’

E’

FIGURE 11-22

5Z 6Z 20Z

pattern - An infinite shape made-up of one or more infinitely repeating themes is called a pattern.

Patterns (page 388)

border pattern - In a one-dimensional pattern there is a theme (motif) that repeats itself in one direction. One-dimensional patterns are called border patterns.

Patterns

border patterns

Translations - Every border pattern has one basic translation symmetry - always in the same direction as the pattern.

……

… Z Z Z Z Z Z …

FIGURE 11-25

Border patterns with (a) no glide reflection symmetry, and (b) with basic glide reflection symmetry.

… x x x x x x …

. . . . . .

. . . . . .

• Read pages 388 – 391

• Page 400: 49 – 52, 72