There are 2 columns' notch doesn't fit. It's not deep enough and I need to modify it to make it fit. The stairs sometime holds 2 marbles at a time but dropped back 1 when lifted half way. So it landed at the lineup of marbles behind and ended up on the floor. I now limited it to 5 marbles only then it works fine. It's not easy to connect them but it have to be tight to be sturdy. So, it's not really good for young kids to deal with. Overall, it is definately a piece of art!
There are 2 columns' notch doesn't fit. It's not deep enough and I need to modify it to make it fit. The stairs sometime holds 2 marbles at a time but dropped back 1 when lifted half way. So it landed at the lineup of marbles behind and ended up on the floor. I now limited it to 5 marbles only then it works fine. It's not easy to connect them but it have to be tight to be sturdy. So, it's not really good for young kids to deal with. Overall, it is definately a piece of art!