| We want to estimate how many leaves grow on this Birch tree
|| We choose a sample area of leaves, and mark it
|| A close-up of the sample area of leaves
|| The sample is divided into ten parts
| We count 120 leaves in one part - so guess 1,200 in the sample
|| 64 samples of 1,200 means 76,400 leaves in this picture
|| There could be a million leaves on this tree!