gistfile1.m

- (UIImage *)mergeImages:(NSArray *)images
{
    return nil; // hand waving
}

- (void)exampleWorkspace
{
    [KZNNodeType registerType:@"MergeImages" inputs:@{@"Images<T>": NSArray.class, @"<T>": UIImage.class} outputs:@{@"Output" : UIImage.class} processingBlock:^(id node, NSDictionary *inputs, NSMutableDictionary *outputs) {
        outputs[@"Output"] = [self mergeImages:inputs[@"Images"]];
    }];

    // MergeImages would have an input "Images" that accepts a UIImage.
    // If you connect a UIImage to "Images", a second circle appears
    // below the connected one letting me pass in another image.
    // And so on
}