Crinkly material and simple contrast illustrations designed for sensory stimulation and development.Author: BRAILSFORD, JILL\r\nDescription: Crinkly material and simple contrast illustrations designed for sensory stimulation and development. Black and White – the most visible and engaging visual stimulation for your baby. Infants reflexively prefer to look at high-contrast edges and patterns. Large black and white patterns present the highest possible contrast (100%) to the eye and thus are the most visible and attractive to babies.