\begin{tikzpicture}
	\hspace*{0.5cm}
	%\onslide<2->{
	
	\draw[black, very thick] (0,0)rectangle (2,2);
	\draw[black, very thick] (0,2.1)rectangle (2,2.7);
	\draw[black, very thick] (0.7,2.8)rectangle (1.3,4);
	\draw[black, very thick] (0.5,4.1)rectangle (1.5,5.1);

	\filldraw [black] (1,1) circle (1pt);
	\filldraw [black] (1,2.4) circle (1pt);
	\filldraw [black] (1,3.4) circle (1pt);
	\filldraw [black] (1,4.6) circle (1pt);
	
	%}
	
\end{tikzpicture}