In its light-hearted approach of presenting exhibits that include everyday items, contemporary design, artwork and historical objects, "Measuring: This Much, That Much, How Much?" at 21_21 Design Sight has its fair share of crowd pleasers.

It begins with the "Perfektron," an installation that cleverly brings together humankind's oldest measuring tool — the hands — with one of our modern equivalents: sensors. If you can accurately judge the size of an apple with your hands, an apple appears on screen. If not, you'll get something the size of your guess — an egg, a grapefruit or if you're particularly spatially challenged, a melon or basketball. It's a simple, fun exercise that highlights the exhibition's strength: It's varied visual interpretations of how humans are constantly seeking ways to measure mass, space, time and value.

Other amusing interactive installations include: videos that allow you to experience traveling at different speeds; the "Pixelman," which will transform your figure into an 8-bit-like pixelated image projected onto a giant screen; and a device that monitors your heartbeat to compare it to that of an elephant and a mouse. Attractive artworks based on physics and geometry are equally entertaining, whether it's a kinetic sculpture moving at various revolutions per minutes or a cute circular bear design that was discovered from repeated drawings of the golden ratio.