Works In some situations, a grid hasn't finished entering the right-hand side, when an object begins receiving on the left-hand side. in those cases you should use #t. The [#t] trigger object sequences grid operations in a right-to-left order. It outputs its input from right to left. Doesn't work (all black) The same grid received in inlet 0 is first sent to the outlet 0 The same grid received in inlet 0 is sent to the outlet 1 after it was sent to outlet 0 The Grid passed in inlet 0 will be first sent to the right most outlet and then to the second from the right (the left outlet in this case).