My sister, her coworker and me got into this idea:

What if anything is truly objective? Everything that we have experience of is (by default) passed through our own perceptions. Those perceptions cause anything and everything to be biased. This is most obviously true for abstract ideas, such as friendship, fear, love, or even time. You could just say the word 'love' to 2 different people and even though the definition will be the same for both, that definition is filled by thier own experiences and perceptions. It is those experiences that they will recall when defining love for themselves. And as such, is completely subjective to that person.

This can even be applied to very concrete ideas such as basic perceptions themselves. An easy one is hearing. The multitude of languages offers a prime example. Sit with 2 other people, you an english speaker and the other two speak a separate language from english but they both know it (I.E. they both know spanish). When one of them speaks, both you and the other spanish speaker are receiveing in thier ears the exact same sounds waves, the same pitch, tone and timber fluctuations and differences in the air pressure. Yet, the other spanish speaker receives these and attaches other meanings to those sounds, be it to describe a feeling, a thought or discussing a sitcom from last night. While you, not knowing that language, hears sounds with no attached meaning.

So this seems like sound itself, very deeply lodged in concrete physical principles, can be perceived differently be separate people and is thus subjective.

This can also be true for color and therefor light in general. Take as an example Color-Blindness. Two people can be looking at a red and purple painting. Both people are receiving into thier eyes the same wavelengths of light that defines those colors. Yet, the color blind one, when those wavelengths enter into thier perception get muddled and differentiation is difficult. So for the same light, completely grounded in concrete physical principles can be received very differently from one person to the next. Thus it too is subjective.

What then is Objective?

The only thing I could come up with is that there are those abstract ideas of friendship, fear, love etc. That there is something that we have attached a definition to and call it sound. That there is this stuff called light that guides so much of our actions. In short, the only objectivity to be found is that there is existence.

Each existence is completely subjective, but existence itself is Objective.

Post your thoughts and also I would be very interested to see if anyone can show me that existence itself is subjective.