7 easy to print cones inspierd by the russian doll Matryoshka. just place them on any surface (preferably the floor) and ask someone to pick them up. Watch them get frustrated because of the cone shape that makes it harder to pick up or pick up more than one at a time.
The video bellow is of my wife trying to pic them up for the first time.
https://www.youtube.com/shorts/ObcplL1rgdg
The author hasn't provided the model origin yet.