Add new comment

Permalink Submitted by Anonymous (not verified) on 30 December, 2016

At least according to Wikipedia the staircase drawn by Escher was discovered by Oscar Reutersvärd first.
(I'd like to insert the link here, but this sites spam-filter blocks it?!)

About text formats

Filtered HTML

  • Web page addresses and email addresses turn into links automatically.
  • Allowed HTML tags: <a href hreflang> <em> <strong> <cite> <code> <ul type> <ol start type> <li> <dl> <dt> <dd>
  • Lines and paragraphs break automatically.