Because if you wave a block over the top of the detector, something you wouldn't ever think of to begin with, the detector will actually activate two out of three times. Whereas, if you do the likely thing, put the block on the detector, it will only activate two out of six times.
Daca miscati un bloc pe deasupra acestui detector se va intampla ceva la care poate nu v-ati gandi, si anume ca detectorul se va activa de 2 ori intr-un grup de 3 miscari; in timp ce, daca pui un bloc pe detector se va activa de 2 ori intr-un grup de 6 miscari.