The vision is Everest..

Hmmm...limit to human imagination!...there isn't one. I think you can be an imaginative-visionary.Now 'others' would question your practicality!... this doesn't count. The argument is simple , you know yourself better than others. What others say is a mere conjecture. It's just about creating an environment around you and culture of clear thinking which is unaffected by any uncongenial factor, so to speak. It's a powerful thought - ' You come this way but once'.
If you want your life to be big enough to be 'counted' follow a vision and the vision should not be an adjustment or a bargain. Aim to be the kindest person you know, the most intelligent you know, the most generous person you know, the most successful(your definition of success will vary, must go by your pre-set success criteria) person you know and so on.Now comes the imagination part, one thing we can't afford in life is to lack imagination. Imagination is an idea, an idea is thought, thought is an action in the making. All great inventions were ideas, someone must have imagined them one fine day.
Just step out, with a vision as high as possible , brimming with youthful energy and confidence. It will just be a matter of time when you scale 'that' Everest.