Approximately 30 centimetres long and weighing 3 kg, this hard limestone block has rounded edges and two very smooth faces. It can therefore be considered a pebble, even if in everyday language we would consider a pebble to be a smaller and lighter stone.

Side 1: A horse is followed by an imaginary being with both human and animal attributes. The reddish area on the left side of the pebble is due to exposure to heat from the hearth.