There are lot of things which we see daily and a lot of discoveries happen everyday. According to me, if they are absolute then it should not change and if it is changing then it should be relative, even our physical appearence.
It is easy to imagine that everything can be seen in relation to another. So it has a relative value.
You set something absolute if you won't accept that its value is relative compared to others.
That does work as long as you can change the values of other things related to it. But it becomes unlogical if you try to set two related things independently absolute.
Although your question can be answered based on a lot of different (relative) contexts ... basicly nothing is absolut and everything is relative.
There exists absolute things (reality) which we don't know but realize with our senses or meters. What happens in this reality we never will know (absolute) but we have our own mental image (relative) we can communicate and of what we are aware.