You will then change from this illusion to another one corresponding to another cause. This is cause and result. No one knows one s own karma - what are the causes and results that are next to ripen. You do not know the karma that has brought about your present life. Neither do you know what cause is coming up next for yourself, nor its result.
Nobody can know or find out about it.
K arma is accumulated. It is built up by your own negative emotions. It is invisible. It is not of any substance or form. Just like the negative emotions are invisible, so is karma.