Ideas for S's are SLOWLY developing in my SLUGGISH brain, but my SYNAPSES are not SENDING SIGNALS throughout my nervous SYSTEM as SWIFTLY as I'd like. Instead of pondering this SAD SITUATION, I invite y'all to SEND and post SUBSTANTIAL and SUPERIOR SNAPSHOTS for this week's theme. No doubt, you will all rise to the challenge and post SINGULAR and SIGNIFICANT images and SCENES. Treat the rest of us to SOMETHING SPECIAL! SO STEP- RIGHT up and dazzle us with your SELECTION! I'll START by SELECTING this SHOT of a STEAM engine in Cuba.