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Why the big globes at the corners of the weldment?

Question asked by Vagulus Dagg on Jun 14, 2015
Latest reply on Jun 15, 2015 by Vagulus Dagg

I have created a simple weldment.  When I try to do simulation tests globes appear at some strategic points (and not others). 

I have been studying tutorial videos 'til I got square eyeballs but no-one explains the mysterious globes.  Can someone please help? 

What do the globes signify?

Why don't they appear at every corner?