This entry in the MathStart series explores the hazards of measuring in nonstandard units. Eager to win prizes from Larry the lifeguard for the tallest tower, longest wall, and deepest moat, Juan, Sarah, and Laura compare their sand castles; they discover that Sarah's castle is three shovels tall while Juan's is but two, Laura's most is one spoon deep while Juan's is two, and Laura's wall is five steps long to Sarah's seven. However, as observant viewers will note, Sarah's spoon is longer than Juan's, her shovel and feet shorter. Wielding a tape measure, Larry explains why inches are more reliable units than spoons, etc. People and objects in Gorton's simple air brushed cartoons stand out distinctly against the green ocean and sun-drenched sand, and lines of measurement are laid out for viewers to compare. With the small type activity notes at the end, this makes a pleasant, painless way for children (and dare we say adults?) to pick up some basic math methodology. For those who resist Larry's strict notions, bring out Loreen Leedy's blithe Measuring Penny (p. 270) for a more generous examination of nonstandard measurements.