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red yellow wave abstract background orange light curve line energy dynamic flow smooth gradient soft pastel delicate gentle calm soothing relaxing peaceful serene tranquil quiet still motionless unmoving frozen solid stable firm fixed secure safe protected sheltered guarded defended fortified reinforced strengthened toughened hardened impenetrable unbreakable invulnerable indestructible eternal everlasting immortal deathless imperishable unfading undying never-ending timeless infinite boundless limitless endless unending unceasing continuous nonstop perpetual