  Percolation properties of the dead leaves model, also known as confetti
percolation, are considered. More precisely, we prove that the critical
probability for confetti percolation with square-shaped leaves is 1/2. This
result is related to a question of Benjamini and Schramm concerning disk-shaped
leaves and can be seen as a variant of the Harris-Kesten theorem for bond
percolation. The proof is based on techniques developed by Bollob\'as and
Riordan to determine the critical probability for Voronoi and Johnson-Mehl
percolation.
