Interpretation of Other World by M. C. Escher in a Droste Effect made with Pixelbender script from Tom Beddard and a spherical effect made with Filterforge.
M.C. Escher and the Droste Effect Presented by Prof. Hendrik W. Lenstra (original video)
This public lecture is coordinated and sponsored by the Banff International research Station for mathematical Innovation and Doscovery (BIRS), The Peter Wall Institute for Advanced Studies at UBC (PWIAS), and the Banff Centre for Arts and Creativity (BCAC).