Have you not seen it yet? Let me provide you a hint. With their legs crossed, two of the women are “seated.”

All right, we will tell you. What do the women have on their seats? Yes, AIR. The women are suspended in midair.

If it escaped your notice at first, it was probably because you never thought that the picture’s problem could be something so improbable. It’s possible that your eyes saw the anomaly, but your brain chose to ignore it and look for something more… plausible because it didn’t consider it a likely source of the issue.