For my electroscope I used a glass cup, smooth without bumps. For the cardboard, I used a cereal box and cut out a circle. I then used a paper clip to put through the middle of the circle. Before I did this, I put some foil at the bottom of the paper clip. Then, I taped the paper clip on and blew up a balloon.  I used felt and my hair. Off camera, I struggled when I used felt, but I did well when I used my head. I also realized that the project might’ve not worked if the there are too big holes in the circle. When I recorded the final video, it worked when I used the felt, but not with my hair. I found out that the positioning of the balloon changes how much the foil moves.