public Set<Being> getSurroundingBeings(Being base, double radius){
        Set<Being> surroundingBeings = new HashSet<Being> ();
        synchronized (beings) {
            for (Being being : beings){
                if (base.getPosition().isInRadius(being.getPosition(), radius) && base != being) {
                    surroundingBeings.add(being);
                }
            }
        }
        return surroundingBeings;
    }