Final critical report for exam, please help me to have a check We need to make a coordinate system on the ground so that audiance could find the points in the constellations. Using conductive ink to replace the wires, so that when people walk and stand on it, the floor is flat enough that audience won‘t feel uncomforetable and be in danger. To make sure that ink won't appct the artistic, we drew ink lines on the back of the board. After we completed the background board that putting on the ground, we used computer to have a test whether it could work. However, we found that when we put the board on the floor, it doesn't work. If we carried it, making it far away from the ground, it was able to work. Therefore, we guessed that when conductive ink touches the ground, it would be earthed that leads electric potential turn into zero. We tested some other places, on the wall, tables, floors with different materials. Also, we tested different materials of cardboard, like paper, cloth. Finally, all kinds of card boards didn't work when we put it on the floor no matter what material the floor was. Without other choices, we decided to use wire although maybe audience would discovered that there are wires under the cardboard. And in order to decrease the feeling of uneven, we removed the protection layers for the wire.