Geisert (Haystack, 1995, etc.) draws upon legions of diminutive pigs to demonstrate the meanings and construction of roman numerals; tubby porculi trot and tussle--in swarms for the larger numbers--about farmyards, a playground, parkland, and a rather scanty junkyard. His distinctive color etchings have a muted cast, but every figure is sharply defined; readers can count the hundreds of piggies on the D and M spreads--plus other objects elsewhere, from water tanks to birds--for themselves. Each scene is captioned with either a numeral, an explanation, or a list. Boggling even the most careful eye (resulting in a typo in the case of ""XXII Big balloons,"" when no more than XII are shown), this curiosity may bemuse more than it educates, but it does give graphic expression to some huge numbers, and so may find a use beyond the alphanumeric byway it explores.