break coastline crash ferocious ferocity fierce foam mediterranean natural nature roar rock rocky Sardinia sea shoreline tide water wave waves branch branches coast HDR lake Nyberg ocean pond spring stone sun sunset tree Balearic Islands blue deep island majorca Mallorca promontory shore Spain beach beyond boulder distance distant ebb far flats horizon low sand abstract artist artistic clouds lichen mountains peace pebble pile pool scotland sculpture serenity tower cliff Cornish cornwall England english Great Britain hard bracken danger green height high hillside Pembrokeshire united kingdom wales welsh