This is just a little cloud that will float over your head. In order for this to work you have to use a program such as MCedit to export a small machine with three command blocks in it that allow this cloud to float above your head. remember to me in minecraft 1.8+ if you want this cloud to work. you also need to go into  the world you are planning to export this to and type in the following commands. 

/gamerule commandBlockOutput false

/gamerule doTileDrops false

Once you put put thoes commands into your world you can export the mechin in. to activate it break the redstone block in the middle of the machine then press Shift and place the redtone block back where the old one was. this will activate the machine and you should have a cloud floating above your head. Oh and one more thing this machine is kinda noisey so you probebly should not have it right next to your house.