The Indian 5 rupee coin comes in so many size/shape/design now-a-days.
And it is going to be a tough task to have automatic vending machines accept them. The picture has only few types of 5 Rupee coins, I had at a time. There are many more in circulation.
Till I saw one of the 5 rupee coin which had "MAHATMA BASAVESHWARA" inscribed on it, I assumed Mohandas Karamchand Gandhi is the only Mahatma!
So who is this Mahatma Basaveshwara ? Are there any other people, who are called Mahatma? I found Jyotirao Phule.
Guess, now coins are released in memory of people, incident etc.. instead of stamps. Can you think of anything equivalent that could be done digitally? Or something is already in use?