Law of Closure:
Humans tend to enclose a space by completing a contour and ignoring gaps in the figure. In the image below (Fig.29) we tend to enclose the empty space and visualize it as a triangle.

Fig.29: Law of Closure: this leads us to perceive a triangle through its edges are not explicitly shown.
Law of Prägnanz (Good form):
A stimulus will be organized into a figure or form as good as possible. Here, good means a combination of simple forms. The above image (Fig.30) appears to the eye as a square overlapping a triangle or the triangle overlapping a square, not a combination of several complicated shapes which is not harmonious and balanced.
Fig.30: Law of Prägnanz (Good form)
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