Is it not simply the case that the brown section is not sitting on the green section, but is moved down to sit level with it therefore creating the space,the other two sections are then shifted around to maintain the original shape.
I will add some quotes from Albert Einstein
"I have no particular talent. I am merely inquisitive."
"It's not that I'm so smart , it's just that I stay with problems longer ."
"It is a magnificent feeling to recognise the unity of complex phenomena which appear to be things quite apart from the direct visible truth."
"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."
But just encase I am wrong perhaps another one of his quotes would be suitable
"If I had my life to live over again, I'd be a plumber."
Well I must go now I have some work to do on the equivalence of mass and energy (E=mc2) hmmmmmm
