What draws children and parents to KEVA planks?

From KEVA: “You build structures by simply stacking the planks. No glue, no connectors. They can be stacked upright which looks like it would be unstable as a house of cards, but even this type of structure is surprisingly stable.

The simplicity is compelling. Just as it is hard to explain why something is funny, it is hard to explain why most people- both children and adults- really become captivated by KEVA Planks.

KEVA planks have the broadest age range appeal of any toy we have ever seen. From preschoolers to architects, each person builds at his own skill level.  KEVA planks is the gift they never outgrow.”