this will mess ya up... we "can see sound and hear colors"...
we hear because we pick up waves/vibrations of a certian frequency with our ears.. altho limited ( 20Hz -20KHz is an average range) and we can see from nearly infrared to nearly ultra violet ( from about 350nM UV to 760nM IR)
and depending on what direction you are moving, to or away from the source of light, the color can change with enuf speed....if you move fast enuf towards a red light source it will become yellow and then green, then blue.
same as if you are moving towards a sound, it will "sound" higher in pitch and then lower as it passes by ( Doppler effect for sound or red/blue shift for light) but the original sound wave never changes in pitch ( frequency)...
If we could hear in the same range that light is produced, we would be able to hear light... but we have eyes to do that
as far as seeing colors beyond the speed of light with our human eyes... no, it would be like trying to listen to a "dog whistle" that produces sound at 40KHz... our ears just cant do it. But with the same "idea" ( Doppler) in mind, UV and X-rays could be visible if you were to travel fast enuf away from them...something basically invisible becomes visible but its not considered light in a true sense since light is specifically denoted to the 350 - 750 nM range.
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hmmm here ya go... lets say "red" water can only make waves that wash up onto the shore once per 3 seconds and "yellow" water does it once every 2 seconds, and "blue" water does it every second and black water has no waves...
if you were to close your eyes and stand at the beach of these 4 lakes you can tell what color the water is by how many times the waves hit your feet... if you were to start to swim into the waves and the times you got hit by the waves increased you would think you were in a different lake ( either yellow or blue) and if you got into a boat and went into the waves so fast you couldnt tell how many waves were hitting you so you would say there were no waves but a smooth surface ( and a smooth surface means no waves thus no color ergo black)...
and on the reversal side of things... if you were in the boat and traveling with the waves, you could actually ride on top of a wave and no longer feel the wave bounces and once again say you were on smooth water ( black)
either this is going to help or totally confuse