Normally the Z axis is plotted from bottom-to-top as shown below :
I got a plot with the axis (axes to be more precise) reversed as shown below:
Is there a way to force the axes to be plotted top-to-bottom?
Mathematica graphics is interactive. Just drag & rotate the plot with mouse till you flip it up side down. You also can do this programmatically:
Here is how I got these options - if you are curious. Produce Mathematica 3D graphics object and play with it by rotating it around. As soon as you like its orientation excute
And get something like this:
NOTE (thanks to @Heike comment below):
In some cases if
which will produce the set of options I showed above.