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Observe
(x0, y0) = T1(x0, y0) = T1(T1(x0, y0)) = T1(T1(T1(x0, y0))) = ...
So (x0, y0) belongs to the square with address 1, the square with address 11, the square with address 111, and so on.
Because the diameters of these squares are shrinking to 0, the address 111... = 1 corresponds to the single point (x0, y0).
Alternately, note that the only point left unchanged by repeated application of T1 is the point with address 111... = 1

Return to Iteration and address shift.