Cut an ordinary household sponge into Vj-inch cubes. Assemble a variety of different-smelling liquids: for example, vanilla, lemon oil, lavender, cloves, vinegar, or extracts of different flowers or herbs from your own garden or from a health food store. Put a drop or two of liquid on each sponge and place it in a 35 mm film canister. Try to make at least five different canisters.
Leave a canister loosely covered in your car door pocket or cup holder, and open it occasionally for a direct sniff. For a stronger, longer-lasting stimulus, wedge the sponge into the car's air vent. Since some odors linger a long time, be cautious about which ones to use in this way.
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