Gathering materials: Cardboard,Sponge, Pen or pencil, Wool, ribbon or string, Sticky tape

Put the cardboard on the sponge and punch holes into the cardboard with a pencil or pen.

Wrap some sticky tape around the end of the wool, ribbon or string to firm up the top.

Choose a starting point and pull the thread through.

Fix the end with a piece of sticky tape, so you do not pull the thread through completely.

Now pull the thread through the holes in a random pattern, learning to go from the top to the bottom and from the bottom back to the top. Until all holes have been  used.