Curated OER
Educational Technology Clearinghouse: Clip Art Etc: Fibula
A brooch, consisting of a pin, and of a curved portion furnished with a hook. The curved portion was sometimes a circular ring or disc, the pin passing across its centre and sometimes an arc, the pin being as the chord, of the arc. The...
Curated OER
Science Kids: Science Images: Fraser Spiral Illusion, False Spiral
This optical illusion image is known as a Fraser spiral illusion, or false spiral. The black arcs appear to form a spiral when in fact they are a series of concentric circles.
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