Ours is the era of consumerism. If you can get one thing, likely you can get plenty of it. Stuff accumulates - it happens in our rooms, just like outdoors - and it creates heaps, mounds, hills, mountains... The same process occurs when we get tired of all these things. We simply get rid of them. Rubbish accumulates and it creates heaps, mounds, hills, mountains... It happens in our rooms, just like outdoors.