Though their styles differ, Hikari Shimoda (featured in HF Vol. 29) and Camilla D’Errico each use a fluorescent color palette and childlike, illustrative imagery to apprehend adult anxieties. The two artists teamed up for their two-person show “Niji Bambini” (which combines Japanese and Italian, the artists’ native tongues, to translate to “Rainbow Children”), opening at Brooklyn’s Cotton Candy Machine on October 10.