No tape, no glue,all cards free standing just one on top another.
.........................................Bryan, how sturdy is this building?
Pretty darn stable. It weighs about 60 pounds.
You'd be surprised what it would take to knock it over.
I mean, certainly it wouldn't withstand the impact of a flying watermelon.
I should have said two watermelons and an apple box.
Watermelon is good.