Wolfram Technology Guide: Dynamic Interactivity  previous | next 
Make Any Type of Graphics Dynamic
A single command in Mathematica makes any type of graphics dynamic.
In[1]:=

Click for copyable input
Manipulate[

 RegionPlot[ x^2 + y^3 < a, {x, -2, 2}, {y, -3, 3}, 

  Mesh -> All], {a, -2, 3}]
Out[1]=