クレーター錯視
↑ “An Impact Melt Crater You'll Flip For”. Slate.com Bad Astronomy. (2013年7月28日). http://www.slate.com/blogs/bad_astronomy/2013/07/28/moon_illusion_how_to_make_a_crater_look_like_a_dome.html
↑ Crater Illusion by Paul Doherty, retrieved September 12, 2015
↑ “Do You See a Mountain or a Crater in this Picture?”. Universe Today. (2015年1月29日). http://www.universetoday.com/118616/do-you-see-a-mountain-or-a-crater-in-this-picture/