According to Osho, neither flowers nor thorns exist objectively; they are projections of your seeing. Wrong seeing makes thorns appear, right seeing makes flowers appear—vision is creation. In true bliss, your inner state overflows and colors the whole world, so you experience only flowers, only bliss. Transform the seer, and the seen changes; as you are within, so existence appears without.
The world feels thorny or full of flowers depending on your inner mood; when you’re truly happy inside, everything looks like flowers.