Machine in My Life :Wheel

 This is the second day of the image challenge : 'Machine In My life
Wheel
 the the most primary
and the most "taken for granted" machine.
Only one thing defies and challenges its might:
the stairs.
You cannot ride on the stairs with your bike.
You have to rely on your legs when it comes to scaling the stairs.

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Image Credit Kostas Michalis
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