Amazing Stairwell Illusion and The answer (architect engineering)

Amazing Escherian Stairwell at R.I.T.

This Escherian Stairwell at Rochester Institute of Technology in New York has an endless staircase that has amazed students and baffled those who've tried to figure it out. These Penrose stairs, designed by a Filipino architect Rafael Nelson Aboganda, with a nod to M.C. Escher, is making everybody to scratch their brains out.

the content is taken from : https://www.thoughtco.com/the-escherian-stairwell-real-or-fake-3299578