bench branches England english Great Britain natural nature oak path peaceful pool Quercus relax rest seat sit spring Sussex tranquil tree water burst danger fields flood grass lake landscape meadows pond river spate trees winter barnacles Cirripedia coast Cornish cornwall low tide Mollusca mussels Mytilus rockpool rocks seashells sessile shellfish advice alert announcement assistance be-careful beware black buoyancy care caution circle circular communicating communication flotation-device information informing kisby-ring lettering life-preserver life-saving-buoy lifebelt lifebuoy lifering lifesaver message no-lifeguard perry-buoy personal-protective-equipment red rescue-aid rescue-device ring-buoy risk risks risky safety safety-device sign signage swim swimming swimming-pool warning warning-sign white abstract background black and white duotone lights magic magical metallic monotone reflection reflections refraction ripples shiny silvery watery waves autumn bush calm flower garden green leaves lily lush mirror park reeds reflect rhodedendron still colour colours conservation fresh fresh water gradient graphic moisture moisturiser rainbow ripple save the planet texture colors eroded erosion pebbles smooth stones underwater worn