misfits!!!!

Whilst at work i often ponder some odd things! why is it...

...sandwiches are square, but sandwich meat(or quorn) is round?

...pizza is round, but comes in a sqare box?cd's are round but they come in square boxes? infact generally, round things come in square boxes!

...a "set-square" is called a set square when it is triangular?

i don't get it!!!