Materials:
- 2 cardboard cups
- Rope up to 1 meter
- Needle to put the rope into the glasses
Making: We pass the rope to the cardboard glass with the help of a needle. We tie the tips so that they don't get out of the cups. Our phone is ready. Then we take one glass ourselves and give the other to our friend or my parents. One of us is talking into the glass and the other holds the glass in his ear and observes sound transfer via tense rope.
