See it twirling !
click on the video-clip below

The combination of marble and spiral creates a fascinating optical illusion- the marble appears to move up and down in the spiral while it is in fact completely stationary.

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Picture and video shown : 12cm marble

2 sizes : small(D.9cm H.50cm) and large (D.12cm H.70cm)

3 colors available : blue, transparent, purple

Four helpful hints to encourage your Astro mobile to turn :
1) Keep the support line as long as possible.
2) Try pulling the support line slightly off centre at the point where the it is attached to the hook.
3) We find that the price label attached to the Astro acts as a sail. Maybe you could attach something similar to facilitate its motion?
4) At shows, the public cannot resist turning the mobile, thus creating a lot of twist in the support line. This then keeps it moving for quite a while.

So, you could either:
A) Place the Astro where people pass regularly, e.g., near a door or much frequented passage.
or
B) For an instant result, "wind up" the Astro yourself for a minute or two - your friends will be delighted and impressed with the resulting ten minutes of bewitching movement! Afterwards they won't be able to resist turning the Astro again, so repeating the process...

(1) and (2) are the techniques we use when displaying the Astro at commercial shows.But even on our show stands the Astro mobile does not turn all the time - then, suddenly, it will start turning for no obvious reason! It seems to have a will of it's own!