I was wowed by an extraordinary video of 3 people levitating a sleek glider—just by walking underneath it. The person behind that and some other interesting videos is Dr. Heinrich Eder, in Munich. In his own words, from correspondence:
“I am a retired physicist once (and until now) busy in radiation protection (mostly medical sites).”
“I performed about 50 workshops at Flugwerft Schleißheim (museum on flight history) mostly on walkalong gliders (we say also "Schubsi" ) but also on indoor models. We built a 1 m glider 20 grams and flew it producing an upwind wave from 3 guys shoulder by shoulder.”