Gross motor - controlling the head, sitting, crawling, maybe even starting to walk. Fine motor - holding a spoon, picking up a piece of cereal between thumb and finger. Sensory - seeing, hearing, tasting, touching and smelling. Language - starting to make sounds, learning some words, understanding what people say.
Because the dark box is blending in with the shadows, however the white box is bright and easier to see
It has increased chemical reactivity and it is primed to do cellular work.