I love matryoshka dolls and it's a great idea to use them to reveal the floor. There will be no dangerous fireworks or chaos with them. I don't know what kind of wood these dolls are made of, but when I opened the first one, there were problems. There were a few knots but a small area appears to have been repaired. There was a bad stain, part of which crumbled when I touched it. There is a bit of a lack of quality control here. At the same time, the dolls were typical nesting dolls. They're notoriously difficult to open, but that would only add to the excitement of exposing the bottom. The five dolls are mostly two-tone, pink and blue. There are no funny graphics, except for the stork on the fourth. The fifth, showing gender, is solid pink with a smiling baby. I like them but due to the lack of control and the high price of just under 30€ I can't recommend them at this time.