What's wrong with floating objects?

["Adrian E. Feiguin" <afeiguin uci edu>]

What's wrong with floating objects? I have created and array and matrix 
class, and I play with reference counting. Sometimes I need to create a 
temporary object that I free right away after some manipulation, and I 
always get gobject to complain that ...

Gtk-WARNING **: A floating object was finalized. This means
that someone
called g_object_unref() on an object that had only a floating
reference; the initial floating reference is not owned by anyone
and must be removed with gtk_object_sink() after a normal
reference is obtained with g_object_ref().

Why would I want to sink it? Can anybody explain the logic behind it? 
It's not clear to me from the documentation, and it's not practical for 
my application. Thanks!

<ADRIAN>