opacity: light levels
opacity: filming her feet
opacity: feet-up swing
opacity: slip set-up
opacity: balance maintenance
opacity: explaining the experience
opacity: setting up to interview
opacity: elbow sensor
opacity: measuring for sensors
opacity: applying sensors
opacity: dual interview 1
opacity: explaining her movements
opacity: computer analysis
opacity: sharing a laugh
opacity: demonstrating
opacity: concluding his explanation
opacity: group analysis
opacity: the sensor table
opacity: measurement for sensor placement
opacity: sensored up
opacity: crowding in to capture
opacity: lonely, spotlit camera
opacity: post-experiment response
opacity: watching her own motions
opacity: answering questions
opacity: safety harness adjustment
opacity: slip 2, in motion
opacity: post-slip interview
opacity: slip explanation
opacity: taping the computer analysis