File:Glaskugel -- 2022 -- 9850.jpg
Experiment with lens ball and light stick The lens ball is placed on a glass plate in front of a black background. The light stick (with adjustable light scenarios) was moved behind the lens ball 来自维基百科，自由的百科全书
Experiment with lens ball and light stick The lens ball is placed on a glass plate in front of a black background. The light stick (with adjustable light scenarios) was moved behind the lens ball 来自维基百科，自由的百科全书
