This heart-warming book has become a classic, selling over a million copies, and is listed as one of the top children's books that encourage kindness towards others. It encourages positive behaviour by using the concrete concept of an 'invisible bucket' that holds your good thoughts and feelings. When you do something kind, you fill someone's bucket; when you do something mean, you dip into someone's bucket and remove some good thoughts and feelings. This book focuses on how our social interactions positively or negatively affect others and encourages all to be kind.