Ubiquitous Archimedean circles

Archimedean circles cover the plane

Reference: Explanation:
The two yellow Archimedean circles cover the plane, that is, any point on the plane can lie inside of one of the circles.
In this sense the circles are ubiquitous. Try to move the red point by your mouse after checking "Move by Mouse".
Please scroll down and click the checkboxes.

Applet programmed by Tadayoshi Harada

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