This is called a rain lamp. If you can see all the strings down and the "poles". What you do is you put oil in the bottom and there is a pump inside the sucks up the oil and then drips down and the light on top reflects off of the oil dripping down making a "rain effect" hence the name - rain lamp. Unfortunately the pump is not working so I am going to see how much it costs to replace the pump...
Not really sure if this is very old but it's cool and I used to love Cracker Jack.