curl / uncurl
stable support for loose soils
curve / flatten
stability in high-flow underwater
curl into a ball / flatten
roll with the wind transport
curve / flatten
spin and glide through air
eject
trigger transformation for seed dispersal
open / close scales
regulate airflow and water transfer
reveal / close gaps
control light transmission
open / close petals
protect sensitive equipment
fold / unfold
weather-sensitive devices or camouflage
coil / uncoil
grip flat or cylindrical objects
snap open
support rapid-release movements
coil / uncoil
grasp vertical objects