8 year olds.
The children spent a day making drawings of sunflowers in a variety of ways. They used pencils, crayons and pastels, on a variety of surfaces. The advantage of having the flowers in the room really helped. They aren't actually sunflowers as you might have noticed, but they did the trick.
The plastic was a donation which the children drew on with wax crayons. They then painted the flowers with acrylic. When the plastic was turned over, the black lines are very visible.