Logic designer's manual

the long version

Dewdney's careful recording gives a baseline for preserving these important messages some of which are from deep human past. These paintings, some of which are very artistic, are in danger of disappearing due to human activity and natural causes which makes the preservation so important. Dewdney himself made major contributions to the field of art therapy and approached the rock paintings with a respect which was not always common in his day...reader's review.