Piggy bank art

Anna emptied her piggy bank this morning and created this "arrow" of 1p, 2p, 5p, 10p and 20p pieces. She was meticulous in creating it, checking each coin for the number and putting it in the correct row - she didn't want to go by the size and colour alone, she had to check for the 1s, 2s, etc. The artwork is in the middle of the living room floor and I have a feeling she won't allow it to be dismantled!