Sensory play has an important role in development.  Sight, smell, hearing, touch, and taste, any and all of these can be incorporated into sensory play. It's not just children who have difficulty with sensory integration who can benefit from sensory play; it's all children. Certain groups of children, such as those who have autism or sensory integration dysfunction disorder who have  difficulty making sense of and organizing all the stimuli that come at them via their senses. The truth is that all children need help learning how to use their senses.  From the day they are born, children are designed to explore the world through their senses. That's why babies and toddlers touch everything and put things in their mouths, and why children make funny noises with their mouths and experiment with how the world sounds with their fingers stuck in their ears. It's why your child spins in circles until they're so dizzy, they fall, then get up and do it again.  Sensory exploration is a child's way of examining, discovering, categorizing, and making sense of the world, and it's beneficial to provide them with opportunities for sensory play whenever possible.