Barnens lexikon was a series of Swedish encyclopedias for children of various ages published in a number of editions.

A six-volume edition with identical contents was released for the members of Barnens bokklubb.

[1] The first edition contained 2 500 entries accompanied by 1 200 coloured images drawn by Tord Nygren.

As publishing loomed closer Nygren needed to produce 50 drawings per week.

At an average rate of 2 hours per drawing he had to work 15-hour shifts seven days a week to finish on time.