The Simplest Fly

“What is this”
“A fly!”
“What kind of fly”
“Well, this is a fly that imitates a beetle”
The fly that he showed me then was really huge one, may be about 2 - 2,5 centimeters or almost and inch in diameter.
“Wow, why is it so big?”
“Because I am an old man, I can not see well”