50-somethings, it's Altair designs! I was looking at Penrose tilings and getting flashbacks to being 8 again with a new pack of felt-tips and those gorgeous geometric designs, and could not remember the name of the drawing pads. A #mastartdons win. Thank you to all who rushed to fill the lacuna.

#19702 #children #drawing #colouring #penrose #tilings #geometry