Part of a project I'm doing requires obtaining a foam ball from a cup. The foam ball is spherically shaped and is 4" diameter. You cannot damage the ball. There are a lot of restrictions, but most designs will not violate them so I will not list them. One requirement however is that our device weigh no more than 1lb. Obtaining the ball will only be part of this device so the actual weight of whatever we use to get the ball must be much less than 1lb. I'm a bit stuck on how to accomplish this task. I'm trying to avoid a grabbing mechanism which would involve more weight and some programming to grab the ball. Instead I'm leaning more to some attraction device such as a vacuum, velcro, or static electricity. The vacuum does not seem practical though. Velcro doesn't seem to stick to the foam ball. Static electricity would be hard to generate in this project and it doesn't seem to work very well. The whole project is just you must build a device that starts at one end of a ping pong table and you must get the ball that is located on the opposite side of the ping pong table and bring it back and hit a button. In the middle where the net used to be, there is fixture that we have to climb over. Does anyone have any ideas on what I can use to obtain the foam ball?