The use of spacing between words contributes to developing the theme in "in Just" because (a.) it provides a feeling of chaos and motion that reflect those aspects of spring.
This poem, which was written by E.E. C(u)mmings, presents the way in which a child sees spring. It makes reference to the changes brought about by a new season. Although spring is 'mud-luscious' and chaotic, it is also a time to celebrate nature. The spacing between words in the poem reflects the feeling of spring and the disarray that characterizes this season.