Table of Contents

Preface vi

The place of innovation in the lives of apes: Wolfgang Köhler in his context Jaan Valsiner viii

Introduction 1

1 Roundabout methods 11

2 The use of implements 26

3 The use of implements (cont.) Handling of objects 69

4 The making of implements 101

5 The making of implements (cont.) Building 136

6 Detours with intermediate objectives 176

7 "Chance" and "imitation" 189

8 The handling of forms 231

Conclusion 270

Appendix: some contributions to the psychology of chimpanzees 275

Index 336