Sensory Shapes Set of 12Sensory Stones set of tactile sensory shapes that offer children the opportunity to extend their understanding of shape through exploratory play and mark making. The ridged and smooth surfaces of the shapes offer children a rich sensory experience and their vocabulary of shape and comparative language will develop as they talk about what they see and feel. Set of 12 includes six shapes in 2 different sizes and thicknesses (for each of six shapes: