Imagine you see a car, and your friend says, "What's that?" You
say, "It's a car." Imagine that the car is missing a wheel, and your
friend asks you the same question. Still, you say, "It's a car." But
what if all four wheels were gone, and the doors were gone, and the
engine was gone. Then, what would you say when your friend
asked, "What's that?" You might say something like, "Junk." We may
not know the exact point of change, but somewhere along the way, in
removing the parts, you'd naturally stop saying, "It's a car."
At what point, and after how much adaptation to modern culture, does
Yoga cease to be Yoga? When Yoga is stripped of its higher goals and
methods, can it still be called Yoga? When is Yoga no longer Yoga?
See also: http://swamij.com/ancientyoga.htm#nolonger