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there are few toys which are exciting as magnetic air fan. you need an old bottle, a bicycle
spoke, two roller magnets with a hole. cut the bottle at a distance of 10cms from the
top. two plastic color tapes and the cut 12 petals. open out the petals and flatten them,
then individually tilt each petal to convert it into a fan blade, it will have a curvature.
you make a hole in the lid of the bottle and press fit a bicycle spoke nut in it. this
is the nut from the inside and you can see the nut popping out. then screw the bicycle
spoke in its nut. now you would require strong magnets, these are roller magnets with a hole
in the middle and they stick to a steel container and they can also roll along. so place these
cylindrical ring magnets into the bicycle spoke, two of them and stick them to the outside
of a steel can. if you place the whole assembly under a ceiling fan, the plastic fan will
rotate and the whole assembly will go round and round the can. it is a terrific toy to
behold. as long as the ceiling fan is on it will keep rotating. so enjoy this toy. and
over here you can see the top view. the fan with the rollers is just going round and round.