1 |
Use a pencil to mark off four equal sections on each 91 cm by 30 cm (36 in. by 12 in.) piece of foam board. |
2 |
Cover the first section with acetate sheets to create a slick surface. |
3 |
Glue 3 small rocks across the middle of the plain foam of the second section. |
4 |
Cover the third section with a piece of hessian or 3 to 4 sheets of cheesecloth. |
5 |
Glue 10 to 12 small rocks on the plain foam of the fourth section. |
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