Are you born stupid or drop on the head as a baby?
Are you born clueless, or are you just really determined to become an idiot?
I just checked, and the default checkpoint does not create a spawnsphere(besides, creating a spawnsphere to spawn on a brick is not the best way, the best way is using the brick as a spawn point itself.)
The spwanspheres of a map are within the simgroup PlayerDropPoints, so you can find all of the map-defined spawnspheres with
for(%i=0; %i<PlayerDropPoints.getCount(); %i++)
{
%sphere = PlayerDropPoints.getObject(%i);
.....
}
However, minigames and other things that use bricks to spawn don't use a spawnsphere, simply because they can use the object itself.