This is a very innovative idea. It is able to fulfil its purpose with the use of the vending machine as a prop to appeal to its audience.

People who see this vending machine would instantly be surprised to see a vending machine with guns in it. The oddity of this immediately strikes them and would engage them to stay on and examine the poster, whereby their eyes would land on the phrase, "This is how easy it is to get hold of a gun in South Africa." 

This allows the poster to get its point across in an effective and powerful way. The designer uses a solemn font type for the phrase to match its message. Along with the guns in the machine is shown to be as easily obtained as a bag of chips, it is able to give the perception of the relaxed gun laws in South Africa. Once the readers understand the message, they would first be horrified, and then sympathetic to the plight of South Africans. Finally, donating to this good cause.

The poster also makes use of dull colours like brown and black to emphasise the mood and seriousness of the poster. Furthermore, the colours do not take away the attention of the guns, and instead play a complementary background role. The guns are able to remain in attention and it is clear to the audience that the whole dominance of this poster is centered around the gun.

The clever use of vending machines to ask for donations is sure to attract people to donate.