This simple iris is created by a series of nested pentagons, each of which is rotated by the same offset within its circumscribing pentagon. Dragging (or animating) point A varies the rotational offset, opening and closing the iris.
This is a prototype of JavaSketchpad,
a World-Wide-Web component of The Geometer's
Sketchpad. Copyright & copy ; 1990-1998 by Key Curriculum Press,
Inc. All rights reserved. Portions of this work were funded by the National
Science Foundation (awards DMI 9561674 & 9623018).
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