Five-digit numbers are memorised by adding a symbol from the NumberShapeSystem to the image, so that 80152 might be represented by Santa writing on a blackboard with a swan (2) tucked under one arm.

Longer sequences of numbers (e.g., PiMemorisation), or sequences of any kind, can be memorised by “chunking” them and committing them to the stages of a “journey”. Journeys are the same as MemoryPalaces for most purposes, although O’Brien seems to prefer outdoor scenes, which may be why he calls them “journeys”. Journeys can be indoor as well, however; one’s first journey is often a tour of one’s house or apartment.