I repeat activities from year to year. Lots of reasons to do this, but one of my favorite reasons is to see how different groups of kids use the same materials. Different groups have different personalities and different interests - and those differences influence the way an activity happens.
We've used wild animals with the blocks...and usually we build zoos.
Two years ago...the kids built a large zoo all together.
Last year...the kids built individual zoos.
This year...the kids built some non-traditional zoos.
Same exact animals and blocks but three different results. Interests, experiences, and peer interactions all make these same materials have very different results.