1. Item, thought or other entity that is not essential.
2. Something that is irrelevant or not pertinent.
3. A piece or part that does not productively contribute to the functioning of the whole.
Extrania. I got it. Don't think you have any extrania? Move from one home to another and extrania is likely to be discovered.
Physical extrania is the most obvious and easiest to deal with; just get rid of it! Drop it off at Goodwill or Salvation Army, give it to a needy neighbor, post it on CraigsList or have a garage sale. If someone wants your extrania, let them have it!
Internal extrania is a little different. Like physical extrania, it tends to accumulate unnoticed in the nooks and crannies of the mind. This mind clutter, luckily, has properties of its more tactile version. Moving makes this extrania obvious and easy to toss aside.
Experiencing long periods of internal dialog on long rides really sweeps the corners and dusts the bookshelves. For many, removing this extrania of the mind is best accomplished on the back of a motorcycle. The physical minimalism of this mode of travel tends to creep into one's soul, making the unneeded obvious.
At that point, it's up to the individual to deal with the extrania as they see fit. Keep it or pitch it along the median... It's all up to the rider.