Standing on an iron grate or placing a cup on the grate of the drip tray have certain practical things in common:
On the one hand, the grille usually holds what is on it and keeps it from falling or going dangerously low, but on the other hand it still lets through what doesn't belong. With the coffee maker, you can place the cup and it will hold and excess water or milk will still flow out. When you stand on the grille, dirt from your shoes can fall into a pit and you still stand. These are the advantages. However, it is unpleasant when keys, small change or anything else important falls down and through the mesh. You might still see it, but you still can't grab it. So a supposedly safe stand can also harbour dangers. So it is crucial on which ground you stand.
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