Sight is a complex function of the brain that extends from the front to the back of the head. The last part of the brain involved in sight is the visual cortex, where sensory...
19 real pictures showing opposite concepts such as night/day, or tall/short. Used to generate discussions and to familiarize children with new vocabulary and even more complex...
The Baric Tablets introduce and refine the concept of the baric sense. While blindfolded, the child endeavors to discern the weight of the tablets. Error is controlled by the...