In some ways, I see this as a plus. Lego Creator kits come with all the parts and instructions to build planes and helicopters, but they do not encourage creative invention. Without instructions, creative invention was the only possibility with the leftover K’nex.
With a little help, Seth built and airplane. Lael, built, well, we don’t know what it is, but she did it herself.
And I put together some gears to show the kids how the large-to-small ratio effects power and speed.