  Recently Valentin Ovsienko introduced a ``shadow" version of the celebrated
Markov triples as the solutions of certain version of Markov equation over dual
numbers. We will discuss similar question for the Mordell Diophantine equation
$$ X^2+Y^2+Z^2=2XYZ+1. $$ We will see that the shadows of the special solution
$(1,1,1)$ can be described using the original Conway topograph of the values of
binary quadratic forms. The shadows of other Mordell triples will be written
explicitly in terms of the corresponding solutions of Pell's equation. Their
growth along the paths on the Conway topograph is described in terms of the
Lyapunov function of the Euclid tree.
