Pentagon Case Studies Pentagon Constructing black areas on soccer balls. Baseball's home plate. Crossing guardrails. Pentagons are useful in showing how groups of animals organize themselves into classes based on size or other characteristics. Animals as small as insects have been observed using this pattern, but it is most common among larger creatures such as lions, tigers, and whales. Using the pentagon to organize your crew is very effective for keeping everyone aware of their assigned tasks during an exercise. Pentagrams also appear in nature where they are used by some plants to capture sunlight under conditions when a flat surface would not provide all the light needed for growth. These structures use angles of at least 120 degrees (5 points) to reflect light onto their lower surfaces. People also use pentagrams in architecture to divide up spaces and to indicate ownership. For example, a landlord might draw one inside each room of a house to show which areas are being rented. Finally, a pentagram appears on some sports jerseys to indicate that the player wears number 5 despite what number he is actually assigned. This is particularly common with football players who are often switched around between wide receivers and quarterbacks.