Dropping a ball through a bubble.
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Previously:
https://www.homemadetools.net/forum/...292#post192261
https://www.homemadetools.net/forum/...088#post184301
https://www.homemadetools.net/forum/...856#post159968
https://www.homemadetools.net/forum/...772#post159795
https://www.homemadetools.net/forum/...704#post151960