My demo completely failed (Mac locked up when connecting to the projector) so I couldn't show what I wanted. If you want to try the demos yourself these are the Github branches I was going show. All these are 70 pixel square calculations for consistent comparison the main master branch increases in later versions.
Human Friendly
Human Friendly makes iOS apps including Fast Lists Sync, Fast Lists and Phonics UK. Please get in touch if you have comments or suggestions.