Today is the 180th Birthday of John Venn, inventor of the often-misused mathematical staple the Venn Diagram. In celebration, Google have made today’s Google Doodle be a playful interactive toy where you can select two categories and it’ll show you something in the intersection.

Here’s some of our other favourite Venn diagrams from the internet:

• ‘Math’, a t-shirt from Threadless.com featuring an otter playing a guitar and a duck playing a keyboard
• These beautiful pop culture Venn diagrams from Stephen Wildish: Holy Venn Diagrams, Santa Venn diagram, the Von/Van Venn and one on Pancakes
• And finally, a blog post from Reflective Maths, on the difference between a Venn Diagram and and Euler Diagram.

Enjoy Venn-day! I hope that your day is the middle bit of a Venn diagram where the two circles are ‘excellent’ and ‘enjoyable’.