Memoria
I was looking for the numbers we save to fill in for forgetting and there was algebra and abacus even the mention had them flooding back and the fives and sevens fell neatly into place recalling the era when people used cathedrals or dovecotes as models for memory dates and places put into a tall Chinese dresser with Shang bronze drawer pulls by which banners at Agincourt could be recalled and horses and riders and blazons on shields