Blindfold a partner and ask them to hold out their palm open upwards.
Select some suitable object (p.e. nailbrush, toothbrusch, toy, etc).
Then perform the following actions, allowing your partner to guess the object at each stage:
1. Gently place the object onto the palm, then remove
2. Stroke the object across the palm
3. Hold the object still and ask your partner to stroke it with their flat palm
4. Finally allow your partner to close their palm around the object
It is hard to guess the object using passive touch alone (stage 1).
Moving it helps (stage 2).
But active touch, where the person moves in relation to the object (stage 3), or controls the manipulation (stage 4), is best.