Lateral Thinking (1)

Lateral thinking is a thinking far away from logical or rational thinking, or you might say it's a thinking outside the box. As an example, someone is asked; 1 + 1 = ?

Commonly people will answer 2, because it is rational, whereby a person with lateral thinking would answer a window. How can it be a window?

Let's see, with 1+1 (red colour) and = (green colour), it will be a window.