In musical terms, it is called "drawing the audience in"... a whisper can make the most profound statements. Stevie Ray Vaughan played large... he really commanded a room with his power and dexterity. But if you've ever seen video of his "Texas Flood", you might notice how he had a habit of turning down the pickups on his guitar til eventually the only sound was the string noise picked up by his vocal mic. The audience would literally hold their breath to catch every note he played... and he made it worth their while. A small print can make a really powerful impact... especially in venues usually known for larger work. I've seen 6x6(cm) contact prints in 16" frames that really command attention. You have to step in and really study the photo, but the ones I've seen really reward your attention. I'm not that brave, nor (most likely) that accomplished, but I really like the look of a small print matted large.