1

2

3

4

5

6

7

8

9

10

11

12

Compare your images with the drawings. Which ones worked and why?

Numbers 4, 5, and 11 worked the best. Because lines are a common element in our causal life, it’s easy to factor out the effect we want.

Which ones didn’t work so well, and why?

Number 7 didn’t work well because filling the frame nicely with the crossed line element is tricky.