The use of samples is the big change from ACL 3 to ACL 4. Rather than being ignored, the sample supplies the goal for goal-directed activities. Samples that are apt to capture their attention include patterns from nature (flowers, trees, landscapes, animals, birds, butterflies, etc.). They imitate the demonstrated directions to complete a goal using striking features. Within ACL 4.0, one feature is used at a time to do an activity and the sample is consulted at the beginning and guides their performance throughout the process.