How to execute a block (or two or more) when an object is not touching a certain object



Hey guys, I just wanted to know how can I execute a block or more when something is not touching a certain other object? (Sorry if I just copy pasted the title) because I am making a new platformer game (Like, If a ball is touching nothing, it will execute a value that makes it fall)


Here is a project by magmaPOP about that here


Thanks @AHappyCoder!