Giant Square Circle Illusion by Steve Kovare

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A large colourful open topped box is shown and spun around to show all sides. The box has an open mesh front through which can be seen a colourful tube inside. The outer square tube is lifted and shown empty.
Now the inner round tube is lifted and also shown empty. While the inner tube is shown, a clear view inside the outer box can be seen through the mesh to be empty. The round inner tube is now replaced inside the outer box.
At the magicians command his assistant suddenly appears inside the inner tube. All tubes are now lifted thus releasing the girl to help with the rest of the magicians act.
A very simple and economic illusion to build and very easy to perform and store.