Colour theory diagram (1810) by Philipp Otto Runge. Runge was one of the first colour theorists to incorporate variations in brightness into the colour wheel, creating colour spheres. 

170mm x 120mm (6 3/4" x 4 3/4"). 

Blank inside for a note from you.

Thoughtfully made and packaged with an Individually wrapped in a compostable bag with a 120gsm recycled kraft envelope.

 Printed with vegetable-based inks on a carbon neutral press using responsibly sourced, 300gsm Italian paper.

made in United Kingdom