This is a round to play some "Charades":

Explaining concepts with mimes/ gestures only, as an interactive game: All the others watch and shout what comes into their mind, what the person who has to explain can then also react upon.

Intellectual associative fun when played with difficult / abstract concepts, too, so: No restricting ruleset.

Drop-in / Drop-out at anytime possible.

offered by: @dreieck