It is the ability to perceive and recognize the form of an object in the absence of visual and auditory information, by using tactile information to provide cues from texture, size, spatial properties, and temperature, etc.
The Mystery Bag (3-6 years) from How to Raise an Amazing Child the Montessori Way ;
The mystery bag has long been a favourite children's activity. Usually it is simply a cloth bag or box with a hole for your child's hands, through which she can touch and manipulate objects that she cannot see.
To play you will need a collection of small object with which your child is familiar and which she can name. While she closes her eyes, place an object inside the bag and challenge her to identify it by touch alone. If your child guesses correctly, you and your child switch roles. Keep this game going for older children by making it more difficult, using different coins, shells, or geometric shapes, for example