How does the fire introduce new character interactions in the Hunger Games?

Fire plays an important role in the hunger games.

Explanation:

Fire plays a huge role in both the Hunger Games and the entire trilogy.

We should not only see the fire because of Katniss who is "the girl on fire". There are more scenes where fire plays an important role that introduces new interactions with the characters. Let's see the cases:

When Rue and Katniss destroy the Careers' supplies, Rue lights 3 bonfires to confuse them and allow Katniss to destroy her things.

In The Hunger Games: Catching fire we have the girl from District 8 who lit a fire at night, which led to her death because she was discovered. Katniss used what was left of that fire to cook.

Here, too, the people in charge of the games, started a fire to gather the tributes in one place and thus fight.

The fire in Katniss and Peeta's suits also served to attract attention and get sponsors, as well as gain enemies.

glamis thou art, and cawdor; and shalt be what thou art promis'd; yet do i fear thy nature; it is too full o' the milk of human kindness to catch the nearest way: thou wouldst be great; art not without ambition; but without the illness should attend it. what thou wouldst highly, that wouldst thou holily; wouldst not play false, and yet wouldst wrongly win: thou'dst have, great glamis, that which cries, "thus thou must do, if thou have it: and that which rather thou dost fear to do than wishest should be undone." hie thee hither, that i may pour my spirits in thine ear; and chastise with the valor of my tongue all that impedes thee from the golden round, which fate and metaphysical aid doth seem to have thee crown'd withal.  

he lacks ambition.  

he is hesitant.  

he lacks courage.  

he has moral scruples.

invention of the washing machine

in the past, people used sticks and stones or scrub boards to clean their clothing. as it was sweaty, backbreaking work, we owe a world of to james king because he created the model for the modern washing machine in 1851. the most important issue was that this machine cleaned clothes while a person cranked the handle. doing this made people who used it develop strong muscles in their arms. later, in 1908, alva j. fisher created an electric washing machine named thor. this one was not the first automatic washing machine. however, it was one of the most popular models at the time.