This cleverly written and illustrated book by Uri Shulevitz celebrates that transition time from day to night...dusk. "Boy with dog and Grandfather with beard" go for a walk on a winter's day and not long into the walk the light begins to change. The reader finds out that this particular winter day is special indeed and with the diminishing natural light comes a world of wonder created by all the inhabitants of the city that is the setting for this story. This beautiful book for young people makes me want to be outside at dusk on all days of the year. A bonus in this book is that the author celebrates books and reading by making libraries and bookstores prominent in the illustrations.