Strobist Info: AB800 Camera Left w/ 30 degree grid @ 1/4 SB-900 behind me @ 1/4 52 week Project starts now. WEEK 1 My kids love playing with this Abacus. I have twin boys that are a little over 19 months old. They have tons of toys but they seem to fight over this thing the most. So after they went to sleep I decided to use it for my project. Just 4 more pieces to go and I think I beat this thing!