The poem reflects my time as an apprentice Fitter and Machinist, 6 years of learning that eventually made me a tradesperson. The reference to billy cans, they are ceramic coated steel liquid holders, the trades persons used them for their individual brews of tea. One of my jobs each day was to make sure that all the billy cans had been filed with a favourite tea flavour. They were then laid out ready for morning and lunch breaks. The apprentice master taught me the secrets to becoming a top class trades person, he also unlocked the secrets to understanding fractions, a School day subject that had me defeated.