© Luke Roberts
All I can say is this makes perfect sense and I wonder why we haven’t come up with this any sooner.
If you are familiar with the LensBabies and bellow-based perspective control, It is Freelensing at its best — the difference with this technique is that there’s no bellow or similar tools involved in moving the lens, this one’s freehanded.
Use with care (don’t drop your expensive glass!) and be creative! Light leaks will happen but it won’t ruin your picture, and there’s no rule whatsoever.