Frobel's third gift call generally building blocks that is separated eight small wooden cubes. This treatise considers the third gift's contents of play, that organise 3 play-forms, life form, beauty form, perception form. The life form combines play of imitation and play of structure, show principle of unity. As child was surround his things, children take notice that God based on all things. The beauty form combines play of design and play of presentation, show principle of opposion-harmony. As balance and order stream under all beauty things, putting together opposition things give an eye for the beauty to our children. The perception form combines play of sense and play of recognition, show principle of partial-whole. As community bound together by common life, children discover own appointed task in Whole life. But, the 3 play-forms and the various plays are not able to classfy in the third gift, 3 lows, low of unity, low of opposition-harmony, low of partial-whole, are joined together in the child's play using building blockes.