Here are various views of the Aikido stance (Aikikai Aikido)
Front View (what the attacker gets to see)
Attacker is always in view. The defender's hands are raised, to offer
protection against direct punches. Fingertips are at eye level. The defenders
Back should remain straight as much as possible during the encounter so as to
maintain defender's balance.
Bottom View. Note the position of the defender's feet.
The tip of the right foot, along with the
tip and heel of the left foot form a triangle. The heel of the right foot
should be pointing to the arch of the left foot, to form the letter "T".
The reason for maintaining this stance is so that the attacker has very
little of the defender to attack against, as compared to when the defender is
facing the attacker head on. Also, this way the defender can step aside and
avoid an on-coming attack more easily. Like when a drunk comes running at you.
Allow the drunken person to come close enough to you so that he/she believes
that you are doomed. Then step out of the way and allow them to pass you by.
Like I said earlier, this takes practice... years of practice. However, some
people do learn fast.