The hole in a spaghetti spoon helps measure specific portions of spaghetti according ot a serving. The amount that fits into the opening on the spoon is a valid estimation of one serving.
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This feature can well be recognized in your Jeans. Believe it or not, but even when jeans were invented, people still used pocket watches. The smaller pocket was thus meant to accommodate a pocket watch.
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Among things with uses unknown, this is a neat idea provided by manufacturers to help you determine the effect of detergents on material which can’t prevent damage. However today you can use it also as a cloth sample incase you want to stitch another garment to match that, the sample comes in handy for the simple reason that the shade and appearance of material on a roller looks a tad different when finally stitched into a garment
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The main reason for an opening at the pen top is to prevent you from choking in case you swallow the pen top while nibbling on your pen.
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There are many things with uses unknown to us like the rivets on jeans and trousers prevent them from damage, wear and tear. Because of rough usage, jeans could easily tear at the seams. Rivets help keep the fabric from tearing at the seams.
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