neat. no good for the typical backyard though huh? need like a couple acres of land just to get a ramp at a workable incline up to a tree-house no? they ought to call them “wheel chair / lazy guy accessible” i’d use the ramp every time.

A wheel is a circular device that is capable of rotating on an axle through its center, facilitating movement or transportation while supporting a load (mass), or performing labor in machines. Common examples are found in transport applications.