After a lump of clay has been
centered on the potter's wheel, it must be opened up and the base formed. This
tutorial will discuss this opening up procedure as well as showing you what to
do when things go wrong. Much like this video, it goes over lots of little
details about how and why certain things are done. In this detailed guide,
we're going over one thing, and that's how to open up the lump of clay and form
the base. A centered lump is our starting point.
1.1 Every single
piece of clay thrown on the wheel is opened up and a base of some kind is
formed.
1.2 The
fundamental premise is simple. Make a hollow in the lump of clay that
differentiates the walls and the base of the pot.
1.3 With
experience you can find center just by feel, but as a beginner it can help to
create a spiral that goes inward.
1.4 You can
easily create a small divot right in the middle so that you have an obvious
target and so you know exactly where to push down.
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1.5 But perhaps
what's more important initially is the positioning of your arms and hands. Just
like when centering the clay, you brace your forearm on the plastic of the
wheel tray and lean your upper body weight slightly onto this arm to brace it.
Make sure your fingers and palm brace securely around the outside of the lump.
1.6 All this
bracing and stability is incredibly important as if your movements aren't
secure during this process, say they're floating up or you're only really using
your thumbs, there's very little to support and guide your movements.
1.7 So don't let
your arms or hands float.
1.8 Instead, and just like when
you're centering, tuck your left elbow into your torso, squeeze your hand
around the lump of clay, and make sure your arm is pushed against the plastic
wheel tray.