A large plastic tray. A seed tray works well.

Sand or earth

Scissors and string

Some objects to bury. You could use coins, shells, bits of jewellery or bones.

A teaspoon

A paintbrush

Pencil and paper

Fill the tray with sand or earth and bury the objects.

Tie the string around the seed trays to divide it into squares.

Draw the same pattern of squares on your piece of paper.

Now excavate the sand tray very carefully. Use the teaspoon to begin with.

When you find something, use the paintbrush to brush away the sand or earth.

Draw the object carefully in the right place on your piece of paper.

Then look for another object and record where you found it.