Abstract: An apparatus is described which optimizes the neurological development in an infant placed therein and which enables the positioning of the infant in relation to a care giver to enhance mutual interaction skills. A plurality of pillows are provided shaped in geometrical configurations. The pillows include two large wedge shaped foundation pillows which mate together and which can be attached to form a substantially rectangular solid. One of the foundation pillows has a hemispherical recess in the inclined surface thereof in which a removable hemispherical detail pillow may be placed. Other smaller detail pillows provide for unidirectional and compound motion in connection with infant activities. The foundation pillow which does not contain the substantially hemispherical recess is provided with a recess to accommodate at least some of the detail pillows for storage.