As they play, identical twins, Holly and Harry, begin to understand sizes and why some things change and others stay the same.
- ISBN10 0876145705
- ISBN13 9780876145708
- Publish Date 1 May 1992 (first published 1 January 1991)
- Publish Status Out of Print
- Out of Print 7 October 2009
- Publish Country US
- Imprint Lerner Publishing Group
- Format Paperback (US Trade)
- Language English