Welcome! ~~~~~~~~ Select which perspective you want. Then just drag around and experiment with the two pieces. When the pieces are above/below each other, they seem to be different lengths, but when they are overlapping each other, you'll realize that they are indeed the same.
Creator (of the game, not the illusion)- Seukeuraechi Hope you enjoy this digital Jawstrow Illusion game! Origins/More about the illusion: https://en.wikipedia.org/wiki/Jastrow_illusion