Extended Box with isVisible predicate

Signed-off-by: Diwank Singh <diwank.singh@gmail.com>
Added bounce function to Ball

Signed-off-by: Diwank Singh <diwank.singh@gmail.com>
Removed reference to body onload

Signed-off-by: Diwank Singh <diwank.singh@gmail.com>
Added a Bricks collection

Signed-off-by: Diwank Singh <diwank.singh@gmail.com>