ascend ascending coil constrain constrict focus focused snail spiral stair staircase tunnel twist twisted blue boulder boundary copyspace drystone grass hill lichen moss pale rock sky stone UP wall climbing man rappel striving activities artificial artificial structure belayer belaying climb climber climbing harness climbing rope climbing technique climbing wall descend descending equipment girl give outdoor sport portable wall safety safety harness shaped climbing holds sport structure surface take Tension youth boy helmet indoor sport rock climbing shoes ascent difficult difficulty hard landscape madeira mount mountain natural nature rocky steep architecture brick elements England english flagstones garden Great Britain stairs steps blue sky cold feet follow footprints footsteps prints snow trail white winter