We bought Izaac some blocks to play with last year. Ever since Izaac had the building blocks we bought for him, he had been enjoying his block building a lot. He love building tall tower with the blocks. The first few times he built his tall tower, it would topple over easily as the base was the same width.
Recently, he was able to build the tower without toppling down by using a wider width as a base.
Here's some snapshots of Izaac building his tower.
Probably it's time to buy more blocks so Izaac could start building higher tower.