How do these things work? Do you touch them or do they work automatically? I always wave my hand on them but was recently told it does nothing. Found in Koeln. :
Pole vault - Wikipedia
Fretz Michael Good Hammer Set of 3 | OttoFrei.com — Otto Frei
Hammer 66426 Fitness-Trampolin Cross Jump, 98 cm Sprungfläche, leistungsstark bis 130 kg Benutzergewicht : Amazon.de: Sport & Freizeit
Physics, technology and the Olympics – Physics World