Saw this on LinkedIn and I think it perfectly sums up LinkedIn
If the hole in the middle is the size of the shaft, then the blue one in the back would be reinforced with a massive shaft, leaving the purple one in the foreground to get torn apart.
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Assuming that one of the remaining two gears is being driven with force, the three other gears are doomed, because their teeth are inappropriately sized to mesh properly. Also, the blue seems to have one more tooth than the red (and there's no problem with that), but the two gears in the background are too different in size to match speeds across those four gears. Something else has to "give." (Probably the teeth?)