Solution to Challenge 1

Folding the tulip and the lily
1. Fold both from squares of the same size (15 cm works well), starting with the preliminary base.
2. Narrow the lower edges of the front and back layers to the centre line on both models.
3. Fold the top flaps down on each, then open the bloom from the bottom.

Two differences
- The tulip has petals that cup together, giving a closed rounded bloom. The lily has four petals that are spread and curled outwards, giving an open trumpet.
- The lily needs the petal tips curled round a pencil, which the tulip does not.

Which was harder to open?
Most people find the lily harder, because the curled petals can crease or tear if the base creases were not sharp first. The tulip only needs to be rounded by blowing into it.

Checkpoint: both blooms are symmetric, the creases are sharp before opening, and you have named two real differences.