How is King Lear presented in Act 3 scene 2 and 4?

By the time we get to Act III, scenes 2 and 4, recent
events have caused King Lear to go mad.

At the beginning of
scene 2, he is challenging the storm to "do your worst".  The storm is also mirroring
the old king's mind which is in turmoil.  His thoughts are short.  His language is
broken.  He is having trouble wrapping his mind around the idea that both Goneril and
Regan have betrayed him.

He has given away his crown.  He
has lost his daughters.  Now that he is no longer a king, having ruled most of his life,
he has lost his identity.

In scene 4, he tells
us,

This
tempest in my mind

Doth from my senses take all feeling
else

Save what beats there: filial
ingratitude

It is also in
this scene that Lear feels compassion, perhaps for the first time, of some else's
suffering when he tells the fool to enter first.  He quickly reappears followed by Edgar
disguised as Poor Tom, a piteful creature.  Lear sees that he is basically naked, except
for a loincloth, and begins to realize that stripped of robes of power and rich clothing
man is nothing but "...a poor, bare, forked animal..."

When
Gloucester trys to help him, he only wants to talk to the "philospher", Poor Tom.  Kent
tells Gloucester,

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Importune him once more to go, my
lord.

His wits begin
t'unsettle.

At the end of the
scene, in his madness, Lear is quite childelike and once told he can bring Poor Tom, he
allows Gloucester and Kent to lead him to a safe shelter.