This experiment tests depth perception. Place a paper cup about two feet in front of an assistant across from you. Ask your assistant to close one eye. Wave a penny about eighteen inches high above the cup and ask the assistant to say "drop" when he believes the penny will drop right into the cup. Try it a few times with one eye closed and then both eyes closed and you will discover that two eyes provide better depth perception.
Make noise makers using film canisters or small jars. Fill two containers with marbles, two with rice and two with a few pennies. Mix up the the containers on a table or desk. The other person in the experiment must pick up one container and shake it while blindfolded and then find the matching sound. A variation of this experiment is to shake one of the containers from various distances from the blindfolded person to test their hearing sense of distance.
Prepare a piece of potato and a piece of apple cut in exactly the same size and shape. Mix up the food pieces. Put on a blindfold or close your eyes. Holding your nose, eat a bite of each piece and see if you can tell the difference. Usually, your tongue can identify bitter, salty, sour and sweet tastes. You smell and taste use the same airway so when you take sight and smell out of the equation, you will lose your ability to distinguish certain foods. You can also carry out the experiment using a volunteer participant.
In this experiment, you will be able to distinguish items that are hot, cold, rough or smooth to demonstrate the various skin receptors used in the sense of touch. Blindfold yourself or a volunteer participant and feel ice for cold, a piece of metal warmed by the sun for warm, an apple for smooth and sand paper for rough. Alternatively, have a blindfolded participant put together a simple child's puzzle consisting of four to six pieces just by feeling the edges to determine the shapes of the puzzle pieces.