title: Scintillating lustre induced by radial fins.
abstract: Radial lines of Ehrenstein patterns induce illusory scintillating lustre in gray disks inserted into the central gaps (scintillating-lustre effect). We report a novel variant of this illusion by replacing the radial lines with white and black radial fins. Both white and gray disks inserted into the central gaps were perceived as scintillating, if the ratio of the black/white fin width were balanced (ie, close to 1.0). Thus, the grayness of the central disk is not a prerequisite for the scintillation. However, the scintillation was drastically reduced when the ratio was imbalanced. Furthermore, the optimal ratio depended on the color of the center disks.
authors.affiliation: Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan; Japan Society for the Promotion of Science, Japan; e-mail:  ktakahashi@fennel.rcast.u-tokyo.ac.jp.
authors.forename: Kohske
authors.initials: K
authors.lastname: Takahashi
authors.forename: Haruaki
authors.initials: H
authors.lastname: Fukuda
authors.forename: Katsumi
authors.initials: K
authors.lastname: Watanabe
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Ueda
keywords: Ehrenstein pattern; luminance contrast; scintilattion; scintillating-lustre effect; visual illusion