Johnson Cup Illusion?

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Guest

Johnson Cup Illusion?

Postby Guest » April 22nd, 2003, 9:31 am

I got a set of Johnson Cups and Balls and brass wand for my Birthday last week (my wife loves me!). Last night I polished them up using Flitz, probably the best metal polish ever made. I placed one of the red balls on top of the cup and from a downward view of this setup, it appeared as though the cup had a glass botton and there was a LARGE red ball inside the cup. This is due to the convex shape of the bottom of the cup. It even had a 3D effect to it. I don't see a way to use this illusion in a performance (yet) but I thought it was an interesting illusion. Is this a known feature of this apparatus?

Guest

Re: Johnson Cup Illusion?

Postby Guest » April 23rd, 2003, 1:13 am

If you keep the room well ventilated while using Flitz, you will find that this 'illusion' does not occur. :)


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