Sensory experiences include touch, movement, body awareness, sight, sound, smell, taste, and the pull of gravity. Distinguishing between these is the process of sensory integration (SI). While the process of sensory integration occurs automatically and without effort for most, for some the process is inefficient. The little fellow below doesn't like the feel of the grass on his feet or hands.
Extensive effort and attention are required in these individuals for sensory integration to occur, without a guarantee of it being accomplished. Below is two videos of a little fellow that I work with. Look at how far he has come in just a couple of weeks! We started by playing in rice and moved back to the grass.