From children of kindergarten age to retired physics teachers: young and old were able to gain an insight into quantum research at our booth and engage in experiments of their own. The very youngest were particularly impressed by the effect of two polarization filters rotated against each other: "Look, Dad, it suddenly gets dark!" Can we do magic? Unfortunately, we had to destroy this illusion by using an egg slicer as a "filter" and light waves from the 3D printer to explain the effect. On the other hand, many of the parents were happy: "Ah! That's why I can see better with my polarized glasses when I'm driving!"
Those who had not yet had enough after the introduction to light polarization were able to delve deeper into the behavior of light right away in the quantum-eraser experiment and gain an insight into quantum phenomena. The green laser in the experiment seemed to magically attract children in particular. Even initially skeptical visitors found it difficult to escape the spell of the weird quantum effects - wave-particle duality, superposition - as the explanation progressed. Often parents turned to their children for help, for whom this was nothing new: double slit, interference, no big deal.