The decision that this design should simulate a map, drawn on a piece of paper, is fairly easily seen in this sketch... as is the title Oak I. Considerably more difficult to make out are the concepts of burn marks (that scribbly mess just above the 'M' in 'mail' is a reminder to develop some burn-holes); to indicate the location of the treasure hunt excavations (the 'X' that's just below the 'L' in 'mail'); to include a whale in the design (scratched in to the left of that scribbled burn-hole); to make a pirate's head the centre-piece of the design.

Perhaps you're wondering why the word "mail" appears in this picture at all. Well... this ball-point pen scribble was quickly sketched on what was, apparently, the only scrap of paper available at the time... a reminder to pick up my brother's mail!