Escher is know for his impossible figures and worlds. It's your job to recreate one of his figures or worlds. Recreate the triangle or waterfall. You can also create your own impossible figure or world inspired or Eschers work. Do not forget to upload your SBS and to mention any references used. In this case copyrighted references are allowed.
Make sure you do not forget to submit an SBS which contains at least 2 intermediate steps, besides that: do not forget to mention your sources!