Age 1-4 is the key time for the correct development of baby fingers and hands. So this special series of books with its easy-to-move sliders can make small hands exercise and move fully and small fingers can push, pull and slide having a lot of fun seeing the images change and finding the appropriate position for all the sliding pieces. The design of the sliders adds “motion” to the static book and the picture moves to make reading a pure funny and surprising experience. Nice, modern illustration style and funny and useful bilingual rhyming texts are for play and learn.