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wave energy background abstract colorful flowing dynamic vibrant luminous ethereal iridescent iridescence holographic spectrum rainbow gradient blend merge mix swirl twirl spin rotate undulate ripple waveform sine cosine tangent cotangent secant cosecant physics mathematics science technology engineering art design fractal geometry pattern texture visual effect motion energy power force momentum velocity acceleration frequency wavelength amplitude phase waveform sine cosine tangent cotangent secant cosecant physics mathematics science technology engineering