A,B,C,D are the light inputs and A1,B1,C1,D1 are the object which absorbs light and there is a diagram showing how you use it. Also this is only supposed to be used for 1 object and not many objects at the same time. This is in beta so it might not work as you would expect mostly because it is only made of 12 logic gates. I did update it to have or gates for a better system and if you want me to increase its size then I will do that soon