Can these steps be carved from this piece of stone?
Attribution: By Mike Tolleb (http://figuresambigues.free.fr) [GFDL or CC BY-SA 3.0], via Wikimedia Commons [Image cropped, resized, and background removed by Kevin Stone]
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Shadow Illusion
Are squares A and B the same colour?
Are squares A and B the same colour?
Duck Or Rabbit?
Is this a duck or a rabbit?
Is this a duck or a rabbit?
What Am I?
Can you tell what this is a picture of?
Can you tell what this is a picture of?
Spinning Dancer
Which way is the dancer spinning?
Which way is the dancer spinning?
Top Hat Illusion
Is the top hat taller, or wider?
Is the top hat taller, or wider?
Who Turned To?
Who is missing?
Who is missing?
Impossible Waterfall?
Is the water flowing uphill?
Is the water flowing uphill?
Blind Spot
A demonstration of your visual blind spot.
A demonstration of your visual blind spot.
Same Colour Eyes?
Are the eyes the same colour?
Are the eyes the same colour?
Colourful Butterfly?
Is this a colourful butterfly?
Is this a colourful butterfly?
Impossible Prongs?
Impossible prongs?
Impossible prongs?
Parallel Cafe Wall Lines?
Are the horizontal lines parallel?
Are the horizontal lines parallel?
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