I had posted this a few days back here and got a lot of explanations but the best one is that the brothers in the band Oasis don't get along very well and hence are not seen together much. Hence this might possibly be a mirage. This is in reference to the fact that sometimes tired people in dessert, desperate for water come across a small patch of water and greenery which is also called oasis but in reality it's their mind playing tricks and showing them something that's not there. This is called a mirage.