As there has been a great deal of discussion lately on here with regards to a persons aura, I thought these little exercises may be helpful for you to try.
If you can find a willing participant or three, a good experiment for feeling peoples auras, follows.
Initially, attempt to realize the feeling of your own aura, (as you may have done when experimenting with psi balls) by creating and physically responding to the experimentation of increasing and manipulating the energy you can create between your own hands.
Observe how this changes with varying the temperature of hands example, even by imagining first negativity and then positive thoughts, what can you perceive from these experiments?
If you can cajole a candidate to sit before you in a normal dining chair, take a position behind them and let your hands rest 4 or 5 inches above their heads. Bring your hands slowly lower and then back up again until you can feel the same "force" which you are familiar with within your own (psi - ball) hands. By moving your hands "over" their bodies you should be able to feel at which areas their auras are larger, also you may notice hot and cold spots in their auras, this could indicate a poorly area on their physical body or some negativity or positively in their energies. This is also how spiritual healers will first "examine" their clients, feeling for "voids" and abnormalities within the auric field of the person before them. (Just be a little careful when going around a sitters head, as too close with your hands can cause headaches from the pressure of you "pushing" their aura.)
Another fun exercise to try, takes a few more people and a little organization, but is remarkably eye opening if you can assemble a crowd. Perhaps try it at a party.
Stand in a group at one end of a hallway or corridor. There should be a good 10/15 feet between the group and a candidate, whom you will position at the opposite end of the corridor with their back to the group. This candidate should be told to focus on projecting their aura, with all their might, out and through their back, and toward the assembled group.
Nominate one person in the group to approach the candidate, as slowly and as quietly as possible. The candidate should shout stop when he/she can feel the other person "entering" their own aura. The next level of the test, is, with some focus the candidate should be able to feel who has entered their aura, and tell the rest of the group who it is, without actually turning around!
Another exercise to try, again if you can assemble a few or even two people, is aura dowsing. This is great fun too.
You will need a pair of dowsing rods, I have copper ones but I believe silver birch, ash or willow work just as well. Approach a person with your arms and rods extended, go very slowly and a step at a time. When the rods begin to cross as you approach, you have detected the person's outer level of auric field.
I love this experiment. Play with variations again, asking to see if the person can concentrate on projecting their aura at various places.