Similar to Cafe Wall illusion, the red lines are actually parallel. Read more about this illusion here.
Hering Illusion with Python Turtle
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Color WheelColor Wheel
In a level 3 project you are asked to draw a Triacontagon Wheel (https://pythonturtle.academy/triacontagon-wheel/). Color the wheel with colorsys library with gradually changing hue values.
Fraser SpiralFraser Spiral
Fraser Spiral is an optical illusion. To some people it looks like a spiral but it just consists of concentric circles.
